 In 2007, Plant contributed two tracks to the Fats Domino tribute album "", "It Keeps Rainin'" with the Lil' Band o' Gold and "Valley of Tears" with the Soweto Gospel Choir.From 2007 to 2008, Plant recorded and performed with bluegrass star Alison Krauss.A duet album, "Raising Sand", was released on 23 October 2007 on Rounder Records.