looking for a song

Hey guys,
I'm sorry that I don't have enough information but I try it. This song was in some car commercial and I even heard it in the radio. There is a beautiful female voice singin' "ah - ah ah ah ah - ..." with no other lyrics.
As I said not many information but can somebody identify this song?
Thank you.

Try "Oh Superman "by Laurie Anderson
http://www.youtube.com/watch?v=0hhm0NHhCBg

Sorry this isn't that song. One more thing, on the beginning of this song there is a male voice singin' "oooo" just for a moment.