1940s in jazz of the time initially met with a divided, sometimes hostile response among fans and fellow musicians, especially established swing players, who bristled at the new harmonic sounds. To hostile critics, bebop seemed to be filled with "racing, nervous phrases". Despite the initial friction, by the 1950s bebop had become an accepted part of the jazz vocabulary. The most influential bebop musicians included saxophonist Charlie Parker, pianists Bud Powell and Thelonious Monk, trumpeters Dizzy Gillespie and Clifford Brown, and drummer Max Roach. The swing era lasted until the mid-1940s, and produced popular tunes such as Duke Ellington's "Cotton Tail" (1940) and
Charlie Parker on Dial material from 1948, including a session with Tadd Dameron's Orchestra, featuring performances by tenor saxophonists Allen Eager and Wardell Gray. The first volume features several sessions. In one, Parker and Dizzy Gillespie perform "Diggin' Diz". In another, described by Yanow as "superior", Parker and Miles Davis on trumpet lead a West Coast septet through several Parker standards, with variant takes. The final session on the album features Parker in performance with a Howard McGhee-led quintet where, according to Yanow, Parker's performance is seriously hampered by his poor physical condition. This volume features the first session, including alternate takes, that Parker