Coldplay's Chris Martin and Jimmy Fallon Cover David Bowie's 'Life on Mars?' for 'The Tonight Show'

The Tonight Show Starring Jimmy Fallon host and Coldplay's Chris Martin threw their hat into the crowded ring of covers of David Bowie's "Life on Mars?" last night, and it's not bad. Martin plays piano while Fallon sings, and his impression of the Thin White Duke isn't too shabby. During the middle of the song, Roots guitarist…