"Monster Mash" is a song that was sung by Princess Bubblegum, with accompaniment by Marsha, in the episode "This is Halloween."
Lyrics[]
Princess Bubblrgum: I was working in the lab, late one nightWhen my eyes beheld an eerie sightFor my monster from his slab, began to riseAnd suddenly to my surprise Marsha: He did the mash, he did the monster mashIt was a graveyard smashHe did the mash, it caught on in a flashHe did the mash, he did the monster mash Princess Bubblegum: From my laboratory in the castle eastTo the master bedroom, where the vampires feastThe ghouls all came from their humble abodesTo get a jolt from my electrodes He did the mash, he did the monster mashIt was a graveyard smashHe did the mash, it caught on in a flashHe did the mash, he did the monster mash Marsha: The zombies were having fun, the party had just begunThe guests included Wolf Man, Dracula and his son The scene was rockin', all were digging the soundsIgor on chains, backed by his baying houndsThe coffin-bangers were about to arriveWith their vocal group, "The Crypt-Kicker Five" He did the mash, he did the monster mashThe monster mash, it was a graveyard smashThey played the mash, it caught on in a flashHe played the mash, he did the monster mash Out from his coffin, Drac's voice did ringSeems he was troubled by just one thingHe opened the lid and shook his fistAnd said, "Whatever happened to my Transylvania twist?" princess Bubblegum: It's now the mash, it's now the monster mashThe monster mash, and it's a graveyard smashIt's the mash, it's caught on in a flashIt's the mash, it is the monster mash Marsha: Now everything's cool, Drac's a part of the bandAnd my monster mash is the hit of the landFor you, the living, this mash was meant tooWhen you get to my door, tell them Model A sent you Both:Then you can mash, then you can monster mashThe monster mash, and do a graveyard smashThen you can mash, you'll catch on in a flashThen you can mash, then you can monster mash