I guess my point isn't about individual bands. I was just using that for a concrete example. To generalize, sorta, in addition to genre-type associations, there are also quality associations. It would be nice if your algorithm could find those, too.

The TiVo is a good example. Just because I like Blade Runner and Alien doesn't mean that I want to watch every half-assed made for the SciFi channel movie. But the TiVo assumes I do, because all it knows is that I like SF movies. If there was some way to say that Blade Runner and Alien are good, but Code Name Phoenix is not, that would be a tremendous improvement.