In addition to appearing in videos, Black and Gass sang backup vocals on the 2003 Styx album "Cyclorama", on the song "Kiss Your Ass Goodbye". Tenacious D lent backing vocals to The Vandals album "Look What I Almost Stepped In...", on the song "Fourteen". Tenacious D appeared on KROQ-FM's twelfth full-length Christmas compilation, "Swallow My Eggnog", with Sum 41, on a song entitled "Things I Want". Gass appeared in the Good Charlotte music video for the song "Lifestyles of the Rich and Famous".