Blendline

Load an outgoing track on deck A and the next track on deck B. Blendline maps the beats, phrases, key and energy of both, finds where one track's vocal can ride over the other's beat, and shows every knob and fader move, bar by bar.

Start here

Hear a perfect blend

Two free tracks are loaded on the decks. Press play to hear Blendline mix them, then follow the mix guide below to do it yourself. Or bring your own music: audio files, or videos to pull the sound from. Files stay on your device.

On a phone? Everything works, but mixing by hand is easier on a computer.

These three demo tracks are just for trying things out. Blendline is best with your own music: press Add songs or drop files on the tracklist. MP3, WAV, AAC and FLAC work, and so do videos (MP4, MOV, WebM): Blendline pulls the audio out so you can mix it. Files stay on your device.
Your set

Tracklist

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    Free tracks to mix · 15 tracks that blend into each other

    House, progressive and trance released by their artists under Creative Commons licences, hosted by Wikimedia Commons. They are listed in mixing order: each one blends well into the next. Add any of them to your set, or better, add your own music.

      A
      Outgoing
      No track loaded
      Choose or drop an audio or video file
      Tempo—
      Key—
      Length—
      Bars—
      Tap the waveform to hear deck A from that barLines mark 8-bar phrases
      B
      Incoming
      No track loaded
      Choose or drop an audio or video file
      Tempo—
      Key—
      Length—
      Bars—
      Tap the waveform to hear deck B from that barShaded zones are the suggested blends
      Mix guide · what to touch, bar by bar

      Mix guide

      Load two tracks to get a step-by-step plan.

      ——
        Mix it yourself

        Free mix

        Play both decks and work the knobs and faders yourself. Every move is recorded. When you like a transition, save it: it lands after No. 3 as a custom mix with its own step-by-step guide.

        A—
        B—
        1. Click a track overview to set its cue point. It snaps to the nearest bar.
        2. Press PLAY on A. Pull B's fader down and turn B's LOW full left.
        3. Press SYNC, then PLAY on B. With bar sync on, B waits for A's next bar so the beats line up.
        4. Press and drag knobs and faders up or down. Nothing moves when you just pass the cursor over them or scroll. Hold Shift for fine moves.
        Press PLAY on A to start. Everything you do is recorded.
        Tempo
        —
        Load two tracks to compare.
        Key · Camelot
        —
        Best transition
        —

        Top transitions

        Times are each track's own position, as your decks show them.

        1. Transitions appear here once both decks are analyzed.

        Beat grid

        Spectral onsets are combed against every tempo from 70 to 190 BPM to lock one steady grid, then bars are found where the sound changes most often.

        Phrases and sections

        Bars are grouped into 8-bar phrases. Big jumps in bass, energy and tone mark sections such as intro, breakdown, drop and outro.

        Key and melody load

        Pitch peaks build a chroma profile matched against 24 keys and shown on the Camelot wheel. Tonal mid-range content stands in for vocals and leads.

        Vocal-first scoring

        Windows where one track carries a vocal or lead while the other plays only drums and bass score highest. Energy flow, section endings, key and tempo come next. Estimates, so trust your ears.

        Sign in

        Save your mixes and tracklists and open them on any device. Mixing never needs an account.

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        Send feedback

        Found a bug, or have an idea? Tell us what happened and what you expected.

        Share a blend

        Share a blend you mixed yourself so other DJs can learn it. Blendline adds your cue points and every move automatically. Your audio is never uploaded.

        To keep Explore useful: only mixes you recorded in Free mix, two different tracks, each with a Spotify, SoundCloud or YouTube link to the song, at least 20 seconds long, with at least two fader or EQ moves.

        Your blend's audio

        Your first two posts are checked by a moderator before they go public. After that, your posts appear straight away.

        Edit profile

        Pictures can be JPG, PNG, WebP or an animated GIF (GIFs up to 5 MB). Everything on your profile is public, including the contact email if you add one. Pictures must be your own or ones you have the right to use.