Hacker News Reader

>if it was notes (for simplicity) E,D,C,D,E,E,E,D,D,D,E,E,E is the start of "Mary had a little Lamb"

As far as I can tell these operate on audio, not symbolic music.

They do (and I said so) - but I couldn't think of an easy way to write that in a post here.

FFT data tends to get quantized, normalized, and counted for analysis purposes.