A fair amount but not exclusively. As examples (but not an exclusive list!), I know Punch really likes Elvis Costello, but captain futility does not (on the other hand, the captain and I have a lot of folk bands in common). I know Shades of Grey and I are both huge Warren Zevon fans, but I don't know how many other folks are. 1965 and I may well be the same person, musically! On the other hand, there are folks with whom I have less in common, like RJ (who's the only person I've ever seen also mention Foxy Shazam, however) and killer peaches, whose musical interests are very, very different than mine. For all these people (and the others on my contact list), though, the quality of their replies is what made me friends with them, not their musical interests. I hope my contacts think the same of me!