"Rock'n'Roll is often presented as a 1950s fusion of black and white music. In actual fact, that fusion had already occurred in the '30s and '40s, and it is symbolised by Western Swing."

"...artists were branded as drunkards and pornographers (which they often were!), and gradually found themselves banned. But all to no avail: by the end of the 1930s, Western Swing was the most popular form of Country Music all the way from El Paso to Nashville. Jazz remained a crucial component of the genre, while certain Western Swing guitarists were themselves among the early innovators of the electric instrument."


http://twilightzone-rideyourpony.blogspot.de/2012/05/western-swing-texas-1928-1944.html

bonus link
http://westernswing78.blogspot.de/