Running right now, for almost an hour, is a search for MP3s with titles containing the words "esquivel," "raymond scott," "george shearing," or "ahmad jamal". Yes, that's OR any of the names. All are quite revered jazz musicians, and since most of their works are out of print, Bearshare would the the ideal place to find their works, don't you think? Not true. "ahmad jamal" and "george shearing" some up with a few hits, but even the recently-deceased (and long name-dropped) "esquivel" has no results whatsoever.
A search for "korn" fills my screen instantly with hundreds of hits. "britney" is just as successful. "moby grape" has none.