Tenacious D appeared on Craig Ferguson last night to promote their new jazz album, entitled Jazz, a limited edition vinyl-only release. They perform a truncated version of the album’s only track, “Simply Jazz,†which Ferguson points out runs 11 minutes and 36 seconds on the record. On the close-up of the album sleeve, you can see that “Simply Jazz†is listed under Side A and “Nothing on Side B†is listed under Side B. Jack Black ends up being a competent smooth jazz singer, showing off his well-known scatting abilities, while Kyle Gass knocks it out of the park with some grade-A jazz flutin’.