On Dec 4th, 1956, Elvis decided to pop into Sun studios to pay a visit to Sam.  While there, he had a chance to check out the latest recording from Carl Perkins, who happened to have a new kid by the name of Jerry Lee Lewis playing piano for him during the sessions.  After chatting for a while, an impromptu jam session began between the 3.  At some point during the fun, John Cash stopped by and joined in. Fortunately for the world, the sound engineer thought it would be a good idea to record the session. Sam Phillips realized the opportunity for some press and called the Memphis paper.  The next day, the paper released the iconic photo of the 4 playing together and dubbed the jam session the Million Dollar Quartet.