The Million Dollar Quartet weren't a group in any normal sense, but were initially more of a photo opportunity and then a freewheeling after-hours jam session between Elvis Presley, Carl Perkins, Jerry Lee Lewis, and Johnny Cash that took place at Sam Phillips' Sun Studios in Memphis on December 4, 1956. It was formally a Carl Perkins session, with Jerry Lee Lewis sitting in as the piano player. At some point Presley and Cash stopped by to observe, and Phillips, recognizing a photo op when he saw one, called a local news photographer, who snapped a photograph of the four music...