Bill Monroe
Bill signed this for me when I was visiting backstage at the Opry. I can identify Mac Wiseman playing guitar but I'll have to do some research to come up with the other members. If you wait a little bit, you can listen to Bill doing Molly & Tenbrooks as he is introduced by Marty Robbins. This live recording would between 1955 & 1958. I'll see if I can pin it down closer.