Harmonica Slim (Travis L. Blaylock, December 21, 1934, Douglassville, TX) is an American blues harmonica player.
He picked up the instrument around the age of 12 and was soon working as part of the Sunny South Gospel Singers gospel group, broadcasting over radio station KCMC in his hometown of Texarkana from the mid-'40s on. By 1949, he moved to Los Angeles, ingratiating himself into the burgeoning blues community, working package shows with Lowell Fulson and the like. He first recorded as a sideman on a group of dates in the mid-'50s for West Coast labels like Aladdin, Spry, and Vita.

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