Firstly, thank you for making this great program
I was wondering, might it be possible to support reading and writing a 'KEY' field, which would contain a brief string describing the audio file's musical key? For example: 'F#', 'A Minor", 'a', 04A' (Camelot Codes), and so on. There seems to be a bit of a standard as this field is recognized by many different audio programs: Serato Scratch Live, NI Traktor, MixedInKey, and RapidEvolution, among others. Further, some music stores tag their downloads with this information (namely, Beatport).
It's a useful tag for DJing and performances, and for anyone who might want to organize music by key signature.
Thank you for the consideration!
Tom
