A mash-up long before the term was coined, “Stairway to Gilligan’s Island” by Little Roger and the Goosebumps came out briefly in 1978 but was quickly pulled from the market due to legal threats from Led Zeppelin’s attorneys. Ultimately it became known due to repeated plays on the Dr. Demento radio show. (I sheepishly confess to owning this 45. I’ve had it for at least 25 years and haven’t played it once since the day I bought it)