Why DJ Software Disagrees on Track Keys 60% of the Time

Three major DJ platforms—Mixed In Key, Rekordbox, and Serato—agree on a track's key only 39% of the time, with disagreements stemming from different algorithms, relative major/minor flips, and varying definitions of key. The single biggest source of conflict is the relative-key flip, accounting for 70% of disagreements. This inconsistency poses challenges for developers building harmonic-mixing tools and DJs relying on automatic key detection.