United States in the 1950s Ernie Ford, Loretta Lynn, Chet Atkins, Guy Mitchell, Nat King Cole, and vocal groups like The Mills Brothers, The Ink Spots, The Four Lads, The Four Aces, The Chordettes, The Jordanaires, and The Ames Brothers. Jazz stars in the 1950s who came into prominence in their genres called Bebop, Hard bop, Cool jazz and the Blues, at this time included Lester Young, Ben Webster, Charlie Parker, Dizzy Gillespie, Miles Davis, John Coltrane, Thelonious Monk, Charles Mingus, Art Tatum, Bill Evans, Ahmad Jamal, Oscar Peterson, Gil Evans, Gerry Mulligan, Cannonball Adderley, Stan Getz, Chet Baker, Dave Brubeck, Art Blakey, Max Roach,
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