Grohl, a fan of theatrical Swedish metal band Ghost, produced their EP "If You Have Ghost". He was also featured in a number of songs on the EP. Grohl played rhythm guitar for the song "If You Have Ghosts" (a cover of a Roky Erickson song), and drums on "I'm a Marionette" (an ABBA cover) as well as "Waiting for the Night" (a Depeche Mode cover). According to a member of Ghost, Grohl has appeared live in concert with the band wearing the same identity concealing outfit that the rest of the band usually wears.