Identifies keys of a song.
From the site: "Mixed In Key is software created for the world's best DJs. With its user-friendly design and trusted technology, Mixed In Key makes harmonic mixing easy.
Mixed In Key takes your mixing to the next level by showing which songs you can mix together without a key clash. It works with all CD decks, Ableton Live, Traktor, Serato Scratch Live, and all other mixing software and hardware. Your DJ sets will always sound smooth and professional. "
Mixed In Key scans your MP3 and WAV files and shows you which songs are harmonically-compatible. With this information, you can eliminate key clashes from your DJ sets.