Stairway to Gilligan's Island

Today we are used to song mashups that set the lyrics of one song to the tune of another. This goes double for the theme to Gilligan's Island, which can all be interchanged effortlessly. But the granddaddy of such shenanigans is "Stairway to Gilligan's Island." 

The San Francisco band Little Roger and the Goosebumps came up with the song in 1977 to fill out their live sets. They recorded and released a single in 1978 titled "Gilligan's Island (Stairway)." Led Zeppelin's management threatened to sue for copyright infringement, which seems hilarious these days. But Little Roger and the Goosebumps couldn't afford a defense, so they pulled the single. It was still played on the Dr. Demento Show just enough to draw a following, because you couldn't forget it once you heard it. The band reissued the song on a 2000 album under the title "Stairway to Gilligan's Island." (via Metafilter)