a relationship like this could be useful in other areas too, like for church hymns, I’ve been wondering about putting in a ticket like this myself actually, specifically a way to note if a mashup uses the vocals or instrumental (or other part) of the original song
I will say, in the past I’ve also used various “Version of” relationships to link works where it seems necessary, like a few mashups where they use sentence mixing to make the vocalist sing a different (third) song
(not technically a mashup, but it’s a good example anyways, I think)
edit: proceed with caution, the song is quite NSFW, lol
I’ll try and find a better example later