Set Organiser for DJs
Your tracks. Your order. Sonata just checks the keys and lets you hear how it flows. You still do the djing.
Drop your tracks hereAdd your tracks
First mix free, up to 10 tracks. No signup to listen. Your tracks stay on this device.
Built for DJs who play their own sets.
- You choose every track.
- You set the order. Sonata only flags clashes.
- Your files never leave your device.
How Sonata helps before a DJ set
- Drop in the tracks you picked.
- See where two keys clash.
- Rearrange it your way, or take its suggestion.
- Hear it run before the night.
- Export it to USB, rekordbox or SoundCloud.
Sonata reads every track
It measures each track’s tempo from the audio itself and maps its beats.
Then you hear it run, start to finish
Blends run 32 bars by default with the beats locked together, and you can preview every transition.
We support the use of
The problem
You need to hear a set before you play it out.
A list of tracks tells you little. You have to plan the order, know which songs go together and hear how it all runs, before you are in front of a crowd.
Hear it first
You only know a set works once you have heard it from the first track to the last.
Sonata plays the whole set through end to end, so you can listen before the night.
Plan the order
Working out which track follows which means trying them against each other, one pair at a time.
Sonata suggests an order with the fewest key clashes first, then a steady tempo. You can rearrange it.
Know what goes together
Two tracks in clashing keys sound wrong together, and you often find out only when you mix them.
Sonata reads the key of each track and shows which blends are in key and which clash.
- KeysCamelot, read from the audio or your tags
- Set tempo60 to 200 BPM
- Transitions32 bars by default, with key lock
- InputMP3, WAV, AIFF or FLAC
- ExportWAV or MP3 at 320 kbps, to USB, rekordbox or SoundCloud
- PrivacyYour tracks stay on your device
Your set, your call
- Is this an auto-DJ?
- No. Sonata is prep. You play the set.
- Does it replace my taste?
- No. It never picks tracks. It tells you if two clash.
- What does it do with my music?
- Your tracks never leave your device.
Frequently asked questions
Straight answers about files, privacy and how Sonata works.
MP3, WAV, AIFF, FLAC and AAC (M4A) files, chosen in the file dialog or dropped in, folders included. OGG and Opus work when your browser can play them. Apart from AIFF, your browser does the decoding, so a file it cannot play is skipped with a notice.
Your tracks stay on this device. They are never uploaded. Sonata reads, analyses, mixes and exports them inside your browser, and saves your mixes in this browser's own storage on this device. It does count anonymous visits and steps, such as how many tracks were added or which export format was used, with no file names and no audio.
Free for one mix of up to 10 tracks, with WAV export. Pro, from 5 US dollars for a weekend, takes the cap off and adds MP3 and rekordbox. USB tracks for Pioneer decks is in beta, on Pro.
The whole set as one file: WAV (16-bit, 44.1 kHz stereo) or MP3 (320 kbps, 44.1 kHz stereo). You can save that file, copy the mix to a USB stick for Pioneer decks, or take it to SoundCloud: download the mix, copy the tracklist, then open SoundCloud yourself. Sonata does not send the file. For rekordbox, a playlist in set order, or an XML file with your mix cues. On the free plan, WAV covers a set of up to 10 tracks, including the USB mix file and the SoundCloud steps. MP3, the rekordbox playlist, the XML file and USB tracks are part of Pro. USB tracks is in beta: MP3, WAV and AIFF files, with BPM, key and mix cues. The mix is made in your browser. A WAV export holds up to about six hours, and longer sets can be exported as MP3.
Sonata runs in your web browser, with nothing to install, on computers, phones and tablets. It relies on your browser to play audio and to keep your mixes in its storage, and which file formats it can read depends on the browser. A list of tested browsers has not been published yet.
It reads each track. The key is the one you chose, else the key in the file's tags, else the one read from the audio, and it is shown in Camelot notation, like 8A. When no clear key can be read, the track gets no key label. The tempo is measured from the audio; a tempo in the tags only helps settle half or double time. Tracks are never transposed, and a key clash is always shown plainly.
Sonata supplies no music: you add tracks from your own library, and your original files are never changed. Only use music you own or have the right to use. You own your mixes, and you are responsible for how you use and share them, including any licences you need to play them in public.
Dropping in tracks and listening need no account. Exporting asks for one. An account is an email address and a password, and nothing else is collected; you confirm the address with a code sent by email. It exists so your saved mixes are yours: each account has its own mixes in the browser, so two people on one computer do not see each other's. An account does not move your mixes to another device.
Open My mixes and use the trash button beside a mix: it removes the mix, its cover and any songs no other mix uses from this browser. A track's menu also has Remove from mix. Clearing the site's data in your browser settings removes everything Sonata saved on this device. To delete an account and the data held about it, email us from the address on the account.
Hear your next set before you play it.
Add your tracks. Sonata suggests an order, flags where keys clash and plays the set through so you can prep with your ears. Then export it to USB for Pioneer decks, to rekordbox, or to SoundCloud.
Your tracks stay on this device. They are never uploaded.