I've intentionally mixed genres to "keep it real"
Clash: London Calling
Marshall Crenshaw: Whenever You're On My Mind
J.S. Bach: Arioso (Ok, technically it's not a song...)
Genesis: Supper's Ready
Rickie Lee Jones: Skeletons
Spock's Beard: At the End of the Day
Elvis Costello: Watching the Detectives
Shootyz Groove: L-Train
L.V. Beethoven: Ninth Symphony (Choral)
Go West: King of Wishful Thinking
Metallica: Master of Puppets
Jane Monheit: Over the Rainbow
S. Rachmaninoff: Piano Concreto #2
Joe Jackson: A Slow Song
King Crimson: Frame by Frame, Exiles
Louis Armstrong: Solitude
Allman Bros.: Melissa
P.M. Dawn: Set Adrift on Memory Bliss
S. Rachmaninoff: Symphony #2
Pat Metheny: First Circle
Remy Shand: The Way I Feel