Not really on topic, but if anyone's interested in the gory details of
the complexities of modelling music, see http://musicontology.com/.

From the intro:

"The Music Ontology Specification provides main concepts and
properties [for] describing music (i.e. artists, albums, tracks, but
also performances, arrangements, etc.) on the Semantic Web."

Disclaimer: Yves Raimond, one of the authors, sits behind me at work.
Cooking up more fiendish things no doubt.

Regards,
Sean