Similar to the famous musical piece, only instead of playing the piano, you receive fellatio underneath it.
Guy: Hey, have you heard 'Moonlight Sonata' before?
Girl: You mean you want fellatio under the piano?
Guy: *Has sex with girl's face*.
possibly one of the most beautiful pieces of music ever performed by anyone ever. Written by Ludwig Van Beethoven.
Moonlight Sonata is the most beautiful thing I've ever heard.