Jools looks back at some of the unique collaborations that have appeared on the show, from the epic combination of Johnny and June Carter Cash, Pops Staples and Carleen Anderson in 1994 to a Dusty Springfield performance in 1995, featuring Sinéad O'Connor and Alison Moyet on backing vocals, and the wonderful pairing of Nick Cave and Shane MacGowan from the first ever series of Later… in 1992.