Ipanema Girl - Jobim
Goodbye Yellow Brick Road - Elton John
Three Little Birds - Bob Marley
Comfortably Numb - Pink Floyd
Moonlight Sonata - Beethoven
Requiem/Lacrimosa - Bach (doesn't really fit the mood, but sounds beautiful
lots and lots of Chopin (Nocturnes, mostly)
Probably forgetting a lot, those are just the ones that spring to mind...