for 'sound' at least (perhaps not for 'lyrics')
Big Bill AHO - Let's Reel and Rock [Melotone 7-06-64] - June 1937
https://www.youtube.com/watch?v=MIu3P4yhl4k
importantly, the Broonzy recording includes a jump blues horn
section, it's not just blues and boogie-woogie; let's compare to:
Roy Brown - Good Rocking Tonight [De Luxe 1093] - 1947
https://www.youtube.com/watch?v=dkBTo6u8CNg
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