Cast of SNL, spoofing the show "VH1:Behind The Music" and the band "Blue Oyster Cult" and their song
Don't Fear The Reaper. :) That particular skit is on the DVD "SNL: The Best Of Will Ferrell", which Ferrell is the one on the cowbell. LOL :)
NBC sometimes repeats the "Best Of..." series when SNL is on haitus.