Don't forget we still have "It is usually the case that a recording is a mix of a performance of a work <http://wiki.musicbrainz.org/work> by a particular artist <http://wiki.musicbrainz.org/artist>, and appears as a track <http://wiki.musicbrainz.org/Track> on releases<http://wiki.musicbrainz.org/Release> in one or more release groups <http://wiki.musicbrainz.org/Release_Group>." below this definition, as well as the block diagram (which will need to be revised to remove audio tracks).
So we already have some real world examples, which may be enough to ground it in reality.
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