Agreed. That's probably because of just how much manual work went into it: "Each song [representative of other songs in its group] is analyzed by a musician in

Agreed. That's probably because of just how much manual work went into it: "Each song [representative of other songs in its group] is analyzed by a musician in a process that takes 20 to 30 minutes per song. Ten percent of songs are analyzed by more than one musician to ensure conformity with the in-house standards and statistical reliability." https://en.wikipedia.org/wiki/Music_Genome_Project https://en.wikipedia.org/wiki/Music_Genome_Project