I myself am fond of the occasional string quartet, and it seems that there is one playing quite loudly on our floor at the moment. As I have been privy to our other floormate's selection of "music" in the past, I can only assume that the quartet is yours. While it is beautiful, it is much louder than anything I've heard emitting from your apartment in the past other than those vicious sounds of destruction a while back, which may or may not have been you, so I suppose I should inquire if: a) your sound system is malfunctioning, b) you are simply not aware how sound carries on this floor, or c) there is some other reason for the high level of volume.
If 'c', as a neighbor and growing acquaintance, may I also inquire if everything is alright?