My feeling is that the most natural way people are going to put in links to clips is in individual threads, as a way of making a point in a discussion about some type of music or some song or tune or some performer. Some of them might be outstanding performances and so forth, some might just be examples that seemed relevant.

But I think it would be good to have some way of accessing these, after the thread in question has dropped out of sight. I'm not sure a permathread is the best way to do that, though I think that a permathread can have a useful role in itself.

The way this kind of thing is done on many sites, such as YouTube itself, is by having tags put in by the person putting something in, in a rough and ready and subjective way, and this works quite well.

Maybe some variant of this, but with the tags being added later, might be possible.

So you'd enter an artist's name, or a musical genre and up would come a list of vids, each one with its existing tags noted. You'd have an option to add additional tags to it if you felt it appropriate, for example referring to an accompanying instrument.