Your source for creating the perfect mashup

Online musical key and tempo estimation

Upload Your Tracks
Quickly find the key and BPM of your entire library to find compatible tracks for your mashups.
Search Our Database
Instantly search thousands of tracks to find the perfect match for your production.
Edit Track Data
We're a wiki! Submit edits and rate our content to help keep us accurate and up-to-date.
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Track uploads are paused

We're rebuilding our key & BPM analysis engine, so uploading tracks for analysis is temporarily unavailable.

Our database of thousands of analyzed tracks is still fully searchable, and you can find the BPM of any song by tapping along to it.