On: Police officer plays Taylor Swift song to keep a video off YouTube

[netr0ute]

They might have done this to extract instruments, and if you can extract one then maybe you can just subtract it from the main recording. https://www.sciencedaily.com/releases/2008/10/081030201607.h...

[recursive → netr0ute]

Identifying the fundamental pitches of notes in a chord is a far cry from subtracting them out of a recording.