been bugging me for a while.

The part when the (past) Doctor emerges from the back door in the cafe in The Impossible Astronaut its a version of "I am the Doctor" but might be music for S6

Think if your on twitter if you were to ask @murraygold he might answer you as he is very good to us fans and a top bloke! but i presume is a variation of the i am the doctor theme fromt he S5 soundtrack a la vale / vale decam etc.....