Head on over to http://www.blackcabsessions.com to see Rivers and Pat perform "Memories" in the infamous Black Cab.The Black Cab Sessions are a unique thing - they put you in a cab in London and start filming. Because of the small size of the cabs, usually only 1 or 2 band members can fit and play. they dont allow rehearsals or second trys - you just belt it out, and whatever happens happens, tha…