Continuing the discussion from Comment track - artist and track - track relationship:
That topic made me think about a relationship I have often wished it would have existed.
We all know parts of tunes that sound like some parts of other tunes.
Sometimes it is intentional (tribute, clin d’œil, plagiat, etc.) and sometimes it is not or we cannot and do not need to know anyway (inspiration, etc.).
I would like this for music and for words.
Maybe it would be better as folksonomy tags kind of system but it is not possible to link that way either.