Does anybody know which (if any) song - I'm sure it's some kind of rap/RnB - features Bach's "Air on a G string"??

I can hear it in my head but can't remember any of the words or who it's by - I'm sure it's just in the intro bit?

Please tell me if I'm going mad and making this up or if this track actually exists

 

http://www.youtube.com/watch?v=ojI0-GCe2as

 

Thanks!
I did remember about 2 minutes after posting what it was, even though i'd been trying to think of it for about an hour with no luck! Typical lol!