Led Zeppelin‘s Robert Plant and singer-songwriter Alison Krauss stopped by The Late Show With Stephen Colbert on Friday (November 19) to perform two songs from their new collaborative album ‘Raise The Roof’.The pair’s latest LP, which was released on the same day as the performance, features 12 new recordings of songs by the likes of Merle Haggard, Allen Toussaint, The Everly Brothers, Anne Briggs, Geeshie Wiley, Bert Jansch and more.