Low Fidelity, Pre-Vintage Rock & Roll

The date is around 1950.

Three guys walk into a small recording studio in Memphis to make a Demo recording. Before turning on the Mic they have a good sip from a jar of some straw colored drink .
They play some of their favourite obscure Blues, Country and Gospel songs into a worn tape recorder with too much echo.
The studio owner gets some of the songs played on the local radio station.
The radio announcer calls it:

“Rock and Roll”