It's hard to pinpoint exactly where rock'n'roll started but if you listen to Sister Rosetta Tharpe you can hear rock'n'roll 15 years before it was a thing.
https://open.spotify.com/user/p6t6u2gmlwqpt8e3bw0l2bquo?si=b-6jDYcNQJ2OcjOhG2R0kg
