Checksum mp3 audio frames (the data and not the headers)

DJ 1E and I have often lamented over the difficulties in version control with our audio collections.  Particularly with our usage of MusicBrainz, there are often pre- and post- processed files that have the same audio data, but different headers.  Traditional full-file checksums (e.g. md5sum) will present different checksums given the header variations. The ideal [...]