I can’t get a signal buy ventolin inhaler asda The Roots have grown considerably since their early ’90s rise. One of the only hip-hop groups to play instruments, they have always worked with an eclectic sonic stew. This has been even more true in the years since they became Jimmy Fallon’s house-band. In that position, they have backed artists from just about every genre. The Roots themselves have backed everyone from Booker T. to John Legend to Erykah Badu. So, from their standpoint, a collaboration with Costello makes sense. If Costello seems like their first co-conspirator not from the hip-hop and R&B world, you haven’t been following them closely enough.