Sorry, still recovering from a 17 hour journey from the Scilly Isles and not quite up to speed. Perfect suggestions for a scrap though, or even a virtual arm wrestle.

CCC - JB and KM???? I have just voted you off... Simon Cowell style.

It's a great idea, but, IMO, not possible. Logistically, the amount of work that it would involve - dealing with all the publishers, record companies and so on, waiting to get clearance from each artist etc - and the actual costs of licensing each track, would make it totally unworkable.