The Stones! Luv 'em or loath 'em, this old tune is a bit of an ear worm - once heard it's hard to get rid of! It's also got quite a nice pounding cadence, so useful when you're on a long un and need something to distract the mind from the tedium of effort that sometimes begins to gnaw.
http://www.youtube.com/watch?v=Xrx_55SgwAY