"BRAINS!"'s a song by the dark cabaret artist Voltaire. It's been described as having a '60s swing sound, which's in contrast to the much more European folk sound of many of Voltaire's older songs. It's also sometimes incorrectly entitled "Brains!". It was written for an episode of The Grim Adventures of Billy and Mandy. Grim Adventures of Billy and Mandy The song was written by Voltaire for the Cartoon Network Show The Grim Adventures of Billy and Mandy, and aired in the episode "Little Rock o… (More on Brains)