Armstrong, Louis. (1901–1971) "Keep Swingin and never stop" - Autograph LetterAutograph letter from the great jazz musician. In green ink, March 5, 1954. "Whattcha See Bob? Man I am jitting these few lines down to tell you to keep Swingin and never stop. I meanes that. 'Hear? From Louis Satchmo Armstrong." Tape remnants at upper corners, else fine. While signatures and signed photographs are reasonably plentiful, signed autograph letters from Armstrong are very rare.