There aren’t a lot of years left, I suspect, when Beatle fans will still be able to see Paul McCartney playing live, singing old Beatle songs in the same key, with his voice hitting the same vocal register (range of tones) he could reach in his prime.He’s got a concert in Ft. Worth two weeks from now, May 17, and I’m tempted to take along my concert buddy, my son, and pay good money to get two front-row seats, despite having to mortgage the house.As far as I’m concerned, McCartney is a part of living history. At the age of ...