I've been listening to a lot of diverse last.fm user's radios. Today while listening to Temujin1234’s Library Radio (a complete stranger, btw) I hit my 20,000th unique artist: Bonecrusher.
Well, naturally, I had never heard of this band before. I was surprised to find they were from the mid 1990s because they sounded, to me, like a late seventies or early eighties macho-type punk band along the lines of D.O.A. - kind of growly, angry, anthem-like. Actually they sort of sound like a D.O.A. tribute band.
For the past several months I've been getting a kick out of listening to a different last.fm user's library radio every day. This has drastically increased my total number of artists. Before now I had been pretty heavily concentrated in my favorite couple of genres.