With classical music, it is very common to have works made of several movements ("hi-level work" like a Symphony). The consequence is that it is a real pain to see the relationship between a multi-movement work and a release that includes it. You must go through the movements (work), then the recordings, then the release.
If there was a possible direct relationship between the work and the recording, it would be possible to see all the releases including a work, and all the hi-level work recorded on a release... the text would be something like "includes a [partial] recording of" / "is [partially] recorded on".
It's just an idea. I know that it would be redundant with the path through "sub-works" and their recordings. It is currently possible to reconstitute the release - work relationship through this path.
However, there would be an added value in some complex cases and it could be a numbered relationship to sorts thing a little bit.
Any further thoughts ?