I gotta have more cowbell, baby.
Christopher Walken as producer, The Bruce Dickinson, to the band, Blue Oyster Cult, while recording (Don't Fear) The Reaper.
The VH1 Behind the Music: Blue Oyster Cult sketch
Saturday Night Live
Season 25, Episode 16
(c) 2000, NBC Studios
Source: http://snltranscripts.jt.org/