Robert's new obsession

On this day in 2004, Robert Plant first sang with bluegrass star Alison Krauss. Their initial pairing took place at a tribute concert to Lead Belly, held at Severance Hall in Cleveland, Ohio.

For the moment, Plant and Krauss's onstage collaboration consisted of two songs Lead Belly had made famous back in his day, "In the Pines" and "I'm Alabama Bound." They also took a stab at Plant's own "Red Dress," backed by Justin Adams and the band Los Lobos.

For the moment, there were no further plans for Krauss to work with Plant again. He changed that, however, when he later approached her about collaborating in the studio.

Three years after their initial performance together, Plant and Krauss released their album, Raising Sand, which was destined for huge sales, critical acclaim and several awards.