History of modern Western subcultures wider audience. A subculture of rural jazz and blues fans had mixed elements of jazz and blues into traditional cowboy and folk song styles to produce a crossover called western swing. Thanks to the prevalence of radio, this music spread across the United States in the 1940s. Radio was the first "almost instantaneous" mass media with the power to create large subcultures by spreading the ideas of small subcultures across a wide area. Bebop, a new jazz subculture, formed from the rebellion against the melodic stylings of swing; Notable players included Dizzy Gillespie and Charlie Parker. In turn, bebop spawned
Tritone substitution Tritone substitution The tritone substitution is one of the most common chord substitutions found in jazz and was the precursor to more complex substitution patterns like Coltrane changes. Tritone substitutions are sometimes used in improvisation—often to create tension during a solo. Though examples of the tritone substitution, known in the classical world as an augmented sixth chord, can be found extensively in classical music since the Renaissance period, they were not heard until much later in jazz by musicians such as Dizzy Gillespie and Charlie Parker in the 1940s, as well as Duke Ellington, Art Tatum, Coleman Hawkins, Roy Eldridge