his extroverted personality and humor, glasses, lip beard and beret, would become the most visible symbol of the new music and new jazz culture in popular consciousness. That of course slighted the contributions of others with whom he had developed the music over the preceding years. His show style, influenced by black vaudeville circuit entertainers, seemed like a throwback to some and offended some purists ("too much grinning" according to Miles Davis), but it was laced with a subversive sense of humor that gave a glimpse of attitudes on racial matters that black musicians had previously kept away from the public at large. Before the Civil Rights Movement, Gillespie was confronting the racial divide by lampooning it. The intellectual subculture that surrounded bebop made it something of a sociological movement as well as a musical one. With the imminent demise of the big swing bands, bebop had become the dynamic focus of the jazz world, with a broad-based "progressive jazz" movement seeking to emulate and adapt its devices. It was to be the most influential foundation of jazz for a generation of jazz musicians. Beyond By 1950, bebop musicians such as Clifford Brown and Sonny Stitt began to smooth out the rhythmic eccentricities of early bebop. Instead of using jagged phrasing to create rhythmic interest, as the early boppers had, these musicians constructed their improvised lines out of long strings of eighth notes and simply accented certain notes in the line to create rhythmic variety. The early 1950s also saw some smoothing in Charlie Parker's style. During the early 1950s bebop remained at the top of awareness of jazz, while its harmonic devices were adapted to the new "cool" school of jazz led by Miles Davis and others. It continued to attract young musicians such as Jackie McLean, Sonny Rollins, and John Coltrane. As musicians and composers began to work with expanded music theory during the mid-1950s, its adaptation by musicians who worked it into the basic dynamic approach of bebop would lead to the development of post-bop. Around that same time, a move towards structural simplification of bebop occurred among musicians such as Horace Silver and Art Blakey, leading to the movement known as hard bop. Development of jazz would occur through the interplay of bebop, cool, post-bop, and hard bop styles through the 1950s. Influence The musical devices developed with bebop were influential far beyond the bebop movement