Country music was not just a refuge for Mack; his affection for it was genuine. In the ’60s, he was fond of organizing after-hours country jam sessions with like-minded rock performers. He recalled one such session in which he and Janis Joplin sang a duet on a George Jones song, “Things Have Gone To Pieces”, accompanied by Jimi Hendrix on electric guitar and Jerry Garcia on pedal steel. (From Wiki)
He bought the number 007 Flying V in 1958 and used it until he died 2 days ago. That’s no Joe Bonamasa, who had a steamer trunk full of guitars on his gig at the Surf a few years ago.