In December 1956, something magic almost happened: Johnny Cash, Elvis Presley, Carl Perkins and Jerry Lee Lewis found themselves in the studio, singing hymns at the same piano. We say “almost” because Cash wasn’t actually there, he showed up for a photo after the actual session wound down. Nonetheless, the “Million Dollar Quartet” is a piece of rock ‘n’ roll history, and became the jumping-off point for a jukebox musical with the hits of all four stars. After a year on Broadway the play hits the Mahalia Jackson Theater this week.