I'd do it all sepately definitely. It really makes more sense that way. Unless the release actually says "Sonic Youth", I probably wouldn't put it in there.
On the other hand, stuff like Sonic Youth/eYe "TV Shit"... you could also put under eYe stuff, since he has a lot of stuff. But then with an SYR with Merzbow, you probably should put that under Sonic Youth as well.
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