Whats the name of the blues song thats the intro to mark lamars friday night radio 2 show?

It goes mmmmm, mmmmm or something similar. Not very helpful i know but i think ive seen it on an add recently as well. Can't remember which one though. This is the link to the radio show http://www.bbc.co.uk/radio2/shows/lamarr...

I would call them and ask them what it was. Good luck finding it!