Elvis Costello stopped by Late Night with Jimmy Fallon to put his collaboration with house band The Roots on T.V. for the first time.  The Philly R&B / soul band and their English power-pop counterpart performed “Walk Us Uptown,” the single from the recently released Wise Up Ghost LP.  There are no announced plans for a Philadelphia show right now, but you can read XPN host Mike Vasilikos’s review of the record for its Album of the Week spotlight here.