In 1999, the Beastie Boys privately recorded a gag country and western album called "Country Mike's Greatest Hits": as C&W albums go, it's pretty good!
Country Mike's Greatest Hits is the legendary full-length country album recorded by the Beastie Boys. Never officially released, it was originally only given out to family and friends of the Beasties as a Christmas gift back in 1999, and bootlegs started showing up a few years later. It has proven to be a very hot collectible, supposedly fetching as much as $400 on eBay.
The only official reference to the album appears on the Beastie Boys compilation The Sounds of Science, which also includes two songs, "Railroad Blues" and "Country Mike's Theme". In the liner notes, Adam Yauch explains:"At some point after Ill Communication came out, Mike got hit in the head by a large foreign object and lost all of his memory. As it started coming back he believed that he was a country singer named Country Mike. The psychologists told us that if we didn't play along with Mike's fantasy, he could be in grave danger. Finally he came back to his senses. This song ("Railroad Blues") is one of the many that we made during that tragic period of time."
(via Neatorama)