I know this is an odd request but I've noticed many songs have classical music back drops like Evanescence - Anything for You which has Mozart or Chumbawumba - Tubthumping - with Clarke's Trumpet voluntary. I remember a couple of years ago, a song came out with Bach in the background but I don't remember the song.
Thanks for helping out - I wish I could give you more info.
I found this on a web page but it doesn't have the song I'm looking for. It was a female singer but I can't remember if it was Air on G, or which piece.