Western swing

Noun
1989, Gunther Schuller, The Swing Era, O.U.P., p. 564: "The most pervasive Southwestern music of all, especially on the radio: the early Western Swing bands, essentially string bands [...] who as early as the beginning 1930s featured guitarists playing improvised single-note lines. These players also pioneered the electric or amplified guitar."
 * 1) A 1930s to 1940s style of U.S. Southwestern country music with a jazz influence, meshing string bands with other instrumentation - especially drums, trumpet, piano, electric guitar and the steel guitar.