Non-M&S rant: classical music tags get horribly mangled on Last.fm. It's tricky figuring out which artist to use: whether to keep the tag as it is (and risk it being a non-artist, such as this one) or leave it as is (skews scrobbling information). If you aren't too lazy to fix your classical music tags, you should look into the performers/composers associated with the piece. I usually tag pieces by composer if I can't find the performer(s) on Last.fm or if I have no idea who performed it. I've given up hope on uniform track names: too many variables (opus numbers, key of the piece, tempo, posthumous/alternate titles, etc.)!