Well, I may have been wrong in my view that Boomer will turn out to be the heroine of Battlestar Galactica; she sure looked pretty villainous last episode. But that won't stop me from speculating that the piano player is the hitherto unseen Cylon named Daniel.
UPDATE: Something along these lines is more obvious than I'd realized. I failed to notice that the piano player isn't there when Tigh and the others show up in response to the song.
