I could find a mainstream use for this plugin, but it needs to allow custom fields as “catnasebaer” suggested, and, accept pieces that are hosted in other than the default WP “media” structure, ideally locally defined URLs and cloud references (I really like to use box.net).
Also, the plugin could/should allow collections of musical pieces and be able to distinguish between individual pieces and collections (i.e. songbooks, fakebooks, etc).
And lastly, digital music might be in one or more digital notation formats such as MXML, Finale, Sibelius, MuseScore, Anvil Studio, etc, etc, etc.
I hope this plugin can be expanded.
TIA.
Dave