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
Debut Records Teo Macero, later a producer with Miles Davis, recorded his first album as a leader as a saxophonist for Debut, an album described by critic Dan Morgenstern as an oddball fusion of Lennie Tristano and Anton Webern. Debut was the label on which the "Jazz at Massey Hall" concert album was first issued. Recorded in Toronto, it features Dizzy Gillespie, Charlie Parker, Bud Powell, Charles Mingus, and Max Roach, and was the last recorded meeting of long-term musical partners Parker and Gillespie. In 1957 Danish bookseller Ole Vestegaard leased the company's catalogue from Mingus and produced recordings on the Danish