Wouldn’t you like to be a fly on the wall when music legends Elvis Presley, Carl Perkins, Jerry Lee Lewis, and Johnny Cash got together under one roof?  Well, here’s your chance.  The hit musical Million Dollar Quartet, now playing Off Broadway at New World Stages, dramatizes the real life 1956 jam session in Memphis, when these four recording superstars all popped in, seemingly by chance, to see Sun Records owner Sam Phillips.  The result is a soundtrack that includes favorites like “Great Balls of Fire,” “I Walk the Line,” “Blue Suede Shoes,” and “Hound Dog.”  You can be sure there’s a “Whole Lotta Shakin’ Goin’ On” over at Million Dollar Quartet, and we’ve got two tickets plus a Playbill signed by the entire cast.