Regarding Carl Perkins; He was a gentlemen whom I had the pleasure meeting and also watching him, Joe Ely and Delbert McClinton at an after hours jam session in Dallas (Nick's on Greenville). Sun was coming up on one heck of a night as everyone left.
There is a great DVD of Carl Perkins, recorded about 1985, with Ringo, George Harrison, Eric Clapton, and others. Excerpts are on YouTube. Sorry about the misunderstanding re JM.