"The Saturday Boy " is a cover of the Billy Bragg song off his "Back to Basics" album.
Jonathan Coulton performed a cover of "The Saturday Boy" at his first London performance. He played the harmonica as well as the guitar. This was also performed at his Austin SXSW '09 show.
"The Saturday Boy" has not as of yet been officially recorded; however, there are two YouTube vidoes of his performance: video 1 video 2