Waffles/What. IU would have said Skittles but I would have been accused of making assumptions
STMusic is shite because of the amount of mislabelled "v0" torrents which are actually limewire quality transcodes.
I'd say Whatcd is the best followed by Waffles, but ideally both used together will get you the biggest selection.
Libble is very good as well and shouldn't be overlooked. I would put Libble third.
For general music those 3 are pretty much the best options and none are too hard to get into. Then if you're interested in soundboards, bootlegs, flac, trance, or niche genres there's probably a good niche site to fit your tastes, but there are too many of them to name here and that's off topic.
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