Cow Bell
One of the greatest instruments ever to grace Blue Oyster Cult
"More Cowbell" is a line from a April 8, 2000 Saturday Night Live comedy sketch about the recording of the song "(Don't Fear) The Reaper" by Blue Öyster Cult. The sketch featured guest host Christopher Walken as music producer Bruce Dickinson and Will Ferrell as fictional cowbell player Gene Frenkle.

Christopher Walken -"I GOTTA HAVE MORE COWBELL BABY"
"Guess what? I got a fever. And the only prescription...is more cow bell! I NEED MORE COW BELL BABY!"