"A jack" meant a worker. As in "jack-of-all-trades." "Now there was Billy Anderson, A jack from Puget Sound, A fella who could lift a ton Like some men lift a pound." -- _Tote-Road And Trail, Ballads of The Lumberjack_, D. Malloch, 1917. Some workers in the mountains hollered loud, e.g., "Timber." Sid Harris (1885-1927), a pianist on the T.O.B.A. circuit in Alabama, wrote the song "Mountain Jack Blues," 1926, which was recorded by Ma Rainey, who was well-known and widely copied.
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