beat-per-minute

KeyFinder is an open source key detection tool for DJs who are interested in harmonic and tonal mixing. Designed primarily for electronic and dance music, it is highly configurable and can be applied to many genres.

MixMeister BPM Analyzer is a program you can use to automatically detect the exact BPM (beats per minute) of any song. The tags in most digital music files provide no BPM information at all, and others contain estimates, which are often inaccurate.

It provides you with song information for a massive library of music. It gives you key, bpm, and even values like how danceable or happy a song is.