Smart Playlist Builder for DJs - Crescendo DJ App

CRESCENDO

ANALYZE. BUILD. PLAY

BUILD SETS

THAT FLOW

Crescendo is the smart playlist builder for professional DJs.

Analyze your tracks, apply harmonic mixing, and generate energy-arc playlists — all from your Android device.

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DJ SOFTWARE

COMPATIBLE

Export to your favorite DJ software

30

CANDIDATE PER STEP

12

CAMELOT KEY POSITIONS

5

COMPATIBILITY TIERS

±8%

BPM GATING TOLERANCE

ANALYZE. SCORE. BUILD.

HOW IT WORKS

Three stages turn your music library into intelligently sequenced DJ sets — no cloud required, everything runs locally on-device.

DEEP ANALYSIS

Crescendo reads audio frames directly from FLAC, MP3, WAV, AIFF and more. BPM is detected via autocorrelation, key via Krumhansl-Schmuckler chromagram, energy via RMS loudness, and YAMNet neural embeddings classify genre

LOCAL DATABASE

All analysis lives in analysis_cache.db — your single source of truth. MediaStore is only touched during the scan phase. This means your edits, overrides, and transitions persist forever, even after reboots.

WEIGHTED BUILDER

The playlist builder scores each candidate track using BPM gating (±6%), five Camelot compatibility tiers, energy arc targeting, artist separation, and vocal/instrumental alternation — then picks via score² weighted-random for natural variety.

HOW EACH TRACK IS CHOSEN

BUILDER ALGORYTHM - STEP BY STEP

1

TRACK SELECT

Pick a track from the active playlist or library to start

2

BPM GATE

Filter all remaining tracks to ±6% of current BPM

3

ENERGY FILTER

Target energy band from arc position (build / peak / breakdown)

4

CAMELOT RANK

Score by harmonic tier: Perfect → Boost → Fuzzy → Drop → Mood

5

CANDIDATE POOL

Top 30 by combined score enter the weighted shortlist

6

SCORE PICK

Random pick weighted by score squared — good tracks win, but not always

PRO DJ TOOLS.

MOBILE-FIRST.

Built by a DJ with 30 yrs behind the decks, every feature exists because a real workflow demanded it - not because it looked good on a feature list.

AI PLAYLIST BUILDER

Seed track → auto-generated set using harmonic mixing, energy arc, genre matching, artist separation, and vocal alternation rules. 30-candidate weighted-random ensures variety across multiple builds.

TRANSITIONS

Pin specific track pairs that you know work live. The builder honors your tested transitions, inserts them at the right moment, and enforces a configurable separation gap so they don't cluster.

SET TIMER

Full-screen set timer with color thresholds: white → yellow → orange → red flashing. Landscape rotation mode expands the display for booth visibility. Pause-hold and reset built in.

WI-FI TRANSFER

Drop tracks from any browser on your local network directly into Crescendo. Nano HTTPD server, folder structure preservation, upload key security. No cables, no cloud, no accounts needed.

TRACK EDITING

Tap any track to correct BPM (stepper), Camelot key, energy level, release year, vocal flag, and genre. Overrides persist in the local database and survive library rescans.

PLAYLIST REPORT

Export a shareable PNG card summarising your set — track listing, BPM range, key spread, energy flow, and runtime. Built for pre-gig planning and post-gig archiving.

ARTWORK PIPELINE

Three-stage artwork loading: MediaStore thumbnail → embedded file tags → ArtworkCache disk store. Covers display inline in library, card view, and playlist without repeat MediaStore queries.

AIFF FLAC WAV

Direct big-endian PCM readers for 16, 24, and 32-bit AIFF. Custom WavTagReader for ID3/LIST chunk metadata. Both formats analysed without lossy re-encoding.

THE CAMELOT SYSTEM.

Crescendo scores every candidate track through five harmonic tiers. Click any key on the wheel to explore its compatible neighbours — and toggle energy direction to see how Boost and Drop moves open up.

Perfect — Same position or ±1. Classic harmonic mix, maximum tonal continuity.

Fuzzy — Flip major/minor at ±0 or ±1. Compatible with a subtle filter.

Boost — +2/+3 rising. Energy lift. Only unlocked with Rising direction.

Drop — −2/−3 falling. Intentional energy release. Falling direction only.

Mood — +4 flat. Last resort fallback, used only when forced.

Camelot Key Matching — Crescendo DJ

Camelot key matching

Click any key to see compatible neighbours by tier. Toggle energy direction to open or close Boost, Drop and Mood moves.

Perfect (±1 same) Fuzzy (flip ±0/±1) Boost (+2/+3 rising) Drop (−2/−3 falling) Mood (+4 flat)

Energy direction:

Rising Flat Falling

Click any key on the wheel to see its compatible neighbours.

Crescendo DJ — crescendodj.app

PIN YOUR

PROVEN PAIRS

TRANSITIONS

After years behind the decks you know which track combinations work. Transitions lets you store those pairs — and the auto-builder will honour them, placing your tested transitions at the right moment in the set.

Configure a separation gap (1–10 tracks) to stop Transitions clustering. Maximum 2 consecutive linked pairs enforced automatically.

TRANSITIONS - EXAMPLE

SEPARATION: 3 TRACKS

CONSECUTIVE: 1/2

HOW TO CREATE A TRANSITION

01. SELECT A TRACK

02. TAP TRACK INFO

03. SEARCH & SELECT

04. SAVE THE PAIR

EVERY SETTING

EXPLAINED

SETTINGS REFERENCE

Tap each setting name in the app to reveal its tooltip, or use this reference for a full explanation of what each control does and when to change it.

Set Duration

Range - 60-240min

Target length for auto-generated playlists in minutes. The builder calculates how many tracks to include based on average track length in your library. A DJ compensation factor is added to account for the reality that DJs don't play full tracks — set this separately.

DJ Play Percentage

Range - 40-100%

What percentage of each track you typically play live (default: 75%). A 5-minute track at 75% = 3m45s effective play time. This feeds the track-count calculation so your built sets actually fit your slot. Has a floor to prevent absurdly short sets.

Opening Energy

Select - 1-5

The energy level (1 = minimal, 5 = peak) of the first track in the set. The builder shapes an arc from this value towards your peak energy target. Low openings (1–2) suit warm-up slots; higher values suit peak-time builds.

Peak Energy

Select - 1-5

The maximum energy level to target during the peak section of the arc. The builder uses this as a ceiling and distributes tracks around it during the climax portion of the set. Setting this to 4–5 produces high-intensity peak sets

Closing Energy

Select - 1-5

Target energy level for the final section. Lowering this below your peak creates a natural comedown at the end of the set — useful for festival main-stage slots where the next DJ needs headroom.

Genre Lock

Toggle - on / off

When on, the builder only picks tracks sharing the same genre as the seed track. When off, genre is used as a scoring bonus but not a hard filter — allowing cross-genre sets. Turn off if you're getting short playlists from a small library. Open Format genre tracks are excluded from lock filtering.

Year Bias

Toggle - New Older Old Any

Applies a soft preference for tracks from a similar release era to the seed track (±5 years by default). Useful for period-specific sets (e.g. "only 2000s trance"). Does not hard-filter — tracks outside the window still appear but score lower.

Artist Separation

Range - 1-10 Tracks

Minimum number of tracks between plays by the same artist (default: 3). Prevents a set feeling like a Greatest Hits compilation. Increase for large libraries; reduce if your library is small and you're getting short playlists.

Vocal Alternation

Toggle - on / off

When on, the builder attempts to alternate vocal and instrumental tracks rather than stacking multiple vocalists in a row. Particularly effective for progressive house and trance where back-to-back vocal tracks can feel fatiguing.

BPM Override

Range - ±3–15%

Overrides the default ±6% BPM gate. Tighten to ±3% for a locked-groove techno feel. Widen to ±10–15% for Open Format or hip-hop sets where BPM jumps are expected. Only change if the default is producing obvious mismatches.

Match Transitions

Toggle - on / off

Master switch for the Transitions system. When off, the auto-builder ignores all stored track pairs and behaves as a standard harmonic builder. Enable to have your pinned transitions inserted into auto-generated playlists.

Transition Separation

Range - 1-10 tracks

Minimum number of tracks between two Transition pairs (default: 3). Prevents your set sounding like it's driven entirely by memorised pairs. Set to 1 to allow adjacent pairs; increase for a more natural flow where transitions feel like happy accidents.

Consecutive Limit

Fixed

Hard-coded maximum of 2 consecutive Transition pairs in a row. This is not a user setting — it is enforced by the builder to prevent Transitions dominating the sequence. After 2 consecutive pairs, the builder forces a standard harmonic pick before checking Transitions again.

Set Length

Range - 30-360 min

Total duration of your DJ set for the countdown timer. This is separate from the Playlist Builder set duration — you can build a 90-minute playlist but run a 2-hour timer for the whole slot including your introduction and warm-up.

Yellow Threshold

Range - mins remaining

The point (in minutes remaining) at which the timer display switches from white to yellow. Default is 30 minutes. Signals you should begin winding down your energy or preparing your closing sequence.

Orange Threshold

Range - mins remaining

When the timer switches to orange. Default is 15 minutes. A clear visual cue that you're in the final stretch — time to start your closing track sequence.

Red Threshold

Range - mins remaining

When the timer switches to red flashing. Default is 5 minutes. The display flashes to command attention even in a bright, noisy booth environment. Time to be on your last track or two.

Landscape Mode

Toggle - on / off

Enables automatic landscape rotation when the DJ Timer is active. In landscape, the countdown fills the screen at maximum font size — readable from across a DJ booth when your phone is propped against the mixer. Requires auto-rotate enabled in system settings.

Jump Buttons

Toggle - on / off

Shows ±1 minute and ±5 minute adjustment buttons on the timer screen. Useful when the promoter changes the set time on the night. Tap to add or subtract time without resetting and re-entering the duration.

Default Sort

Select - Track Info

Sets the default sort order for your library view. Title and Artist are alphabetical; BPM sorts ascending by tempo; Energy sorts highest-first; Date shows most recently added first (useful for finding new imports quickly).

View Mode

Toggle - List / Card

Switches between a compact list view (more tracks visible) and a card view (larger artwork, better for browsing visually). Card view column count adapts automatically to screen width.

Show BPM in Library

Toggle - on / off

Displays the detected (or manually set) BPM next to each track in the library list. Turn off if you prefer a cleaner view or are working from a library with unanalysed tracks where BPM shows as 0.

Show Camelot Key

Toggle - on / off

Displays the Camelot key (e.g. 8A) alongside each track. Colour-coded by position on the wheel. When off, just the raw musical key (e.g. Am) is shown if enabled.

Popular / Latest Tabs

Toggle - on / off

Shows Popular (play-count ranked) and Latest (date-added) quick-access tabs at the top of the library. You can clear these lists from the Advanced settings without affecting your main library or analysis data.

Auto-Analyze on Import

Toggle - on / off

Automatically runs full audio analysis (BPM, key, energy, genre) on any new tracks added via TrackDrop. Recommended to leave on. Turn off if you're importing large batches on mobile data and want to defer analysis to Wi-Fi.

TrackDrop Upload Key

Security - Custom String

A passphrase required to upload files via the TrackDrop Wi-Fi server. Anyone on your local network who knows this key can upload to your device. Set something non-obvious. The key is stored locally and never transmitted to any external server.

TrackDrop Port

Default - 8080

The port the NanoHTTPD server listens on. Change if 8080 conflicts with another app on your network. Access TrackDrop by navigating to http://[device-IP]:[port] in a browser on the same Wi-Fi.

Clear Popular List

Action - Tap to clear

Resets all play-count data used to populate the Popular tab. Does not delete tracks or analysis. Useful after a big library reshuffle when old popularity data no longer reflects your current usage.

Clear Latest List

Action - Tap to clear

Clears the Recently Added tab without deleting any tracks. Useful if you batch-imported a large archive and don't want those older tracks flooding the Latest view.

Re-Analyze Library

Action - Full rescan

Triggers a full re-analysis of all tracks in the library. Useful after a major Crescendo update that improves BPM or key detection. Warning: this will overwrite manually set BPM/key overrides for any track that doesn't have a locked override flag.

Purge Partial Entries

Auto - On Startup

Crescendo automatically removes partially-analysed database entries on startup (tracks that failed mid-analysis). You can also trigger this manually. Safe to run at any time — complete entries are never touched.

DJ SOFTWARE

COMPATIBLE

REKORDBOX

SERATO

DJ.STUDIO

TRAKTOR

VIRTUAL DJ

NO ADS - NO PAYWALLS - NO LOGINS

CRESCENDO JUST LETS YOU GET ON WITH WHAT YOU DO BEST - DJING

WHAT IS CRESCENDO?

YOUR SET, BUILT THE WAY YOU THINK

Crescendo is a playlist management app for DJs who care about the flow of a set — not just the tracklist. Analyze your music, build intelligent playlists, and prepare every performance with the same instincts you've spent years developing.

DJING USED TO BE ABOUT READING THE ROOM

Not just picking tracks — feeling the energy shift, knowing when to push and when to pull back, building a journey that the crowd felt before they understood it. That craft took years to develop, and it lived in the DJ's head. Somewhere along the way, the tools stopped caring about it. Streaming libraries, sync buttons, algorithmic queues — they optimized for convenience and forgot about the arc. The art of the journey got lost.

THE TOOL THAT THINKS THE WAY YOU DO, SO YOUR SETS FLOW THEY WAY THEY SHOULD

Crescendo brings professional DJ thinking — Camelot mixing, energy arc management, BPM-aware sequencing — into an Android app you can use anywhere, anytime.

THE JOURNEY ISN'T LOST, IT JUST NEEDED THE RIGHT DIRECTION

PLAYLIST BUILDERS

Creativity your way! Choose how you want to curate your playlist with structured builders

AI ASSISTANCE

Use AI to quickly structure the right music just how you want it with DJ specific tools

CAMELOT KEY CONTROL

Choose how you want to connect your music flow and control your set dynamically.

PLENTY OF SETTINGS

Plenty of options to customize your curation experience. Setting to match your workflow

REALTIME PLAYLIST BUILD

Simplified creation. Select a track, Genre, Set Length, Energy Flow & music age

PLAYLIST ENERGY FLOW

See your Playlist Energy Flow live and interact. Swap Tracks & add Transitions

PLAYLIST STATS

See what your playlist contains and how it flows. Know your stats to gain real DJ set insights

EXPORT TO DJ SOFTWARE

Export your playlists back to your DJ software for seamless integration in seconds

HOW IT WORKS

SELECT A TRACK → SHAPE THE ENERGY ARC → WALK AWAY WITH A CREATIVE SET

DROP A SEED TRACK

The playlist builder reads its BPM & Camelot key, then works forward through your analyzed library - scoring every candidate on harmonic fit, tempo proximity, bass frequency and tone

SHAPE THE ENERGY ARC

Set your target BPM range and how you want the energy to move across the set. The arc pre-filters the candidate pool — low-energy tracks don't get called up during a peak, high-intensity ones don't creep in during a breakdown.

HARMONIC SCORING

Every candidate is rated across five Camelot compatibility tiers — PERFECT, FUZZY, BOOST, DROP, and MOOD. The builder scores on key, tempo, and energy position simultaneously so transitions always make musical sense.

WEIGHTED-RANDOM SELECTION

The top 30 candidates are shortlisted at each step, then picked using score² weighted selection. Best options come up most, but with enough variation that no two builds from the same seed sound identical.

LOCKED TRANSITIONS

Any track pairs you've pinned via Transitions are respected unconditionally. The builder routes around them, enforces your separation gap, and keeps your signature moves exactly where you put them.

EXPORT AND PLAY

When the set looks right, export to M3U. Load it straight into Rekordbox or Serato — file paths are preserved exactly as your DJ software expects them.

FREQUENTLY ASKED QUESTIONS

Here are some common questions about CRESCENDO

What data do you collect?

We dont believe in data collection, We are djs first. No data is collected by Crescendo, your music, your DJ information resides locally and is never shared to anyone or collected.

Are there any ads?

No. We want the Crescendo experience to be focused on djing, the part that matters. No ads will ever get in the way of your craft.

Whats included in my purchase?

Everything. We dont believe in paywalls. Crescendo is a 1 cost subscription that includes all features now and in the future (and there are some nice ones in the pipeline too)