What is your favorite reference music?

I just got started in this downward spiral of a hobby, and I have found myself going back to the same 3 or 4 artists and songs to test new pieces of equipment. Here are some of my favorites:

1.) Rodrigo y Gabriel - Diablo Rojo
2.) Air - Universal Traveler
3.) OutKast - Morris Brown
4.) Turin Brakes - Average Man

What is your favorite reference music?