This week, we return to the "Million Dollar Quartet" and take our own deep dive to investigate two figures well-known to the Beatles: Johnny Cash and Carl Perkins.     We theorize on the distribution of Sun Records throughout Europe in the fifties, how many times Carl Perkins was in the studio with the Beatles, and solo encounters between one or more of these rock icons.  In one show, we manage to touch down in New Jersey, Hamburg, London, Jamaica, Tennessee before returning home to Houston.     Enjoy the trip!