section_path: Post-war jazz/Bebop
section_name: Bebop
paragraph_text: Bebop
  
  In the early 1940s, bebop-style performers began to shift jazz from danceable popular music toward a more challenging "musician's music". 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. Divorcing itself from dance music, bebop established itself more as an art form, thus lessening its potential popular and commercial appeal.
  
  Composer Gunther Schuller wrote: "In 1943 I heard the great Earl Hines band which had Bird in it and all those other great musicians. They were playing all the flatted fifth chords and all the modern harmonies and substitutions and Dizzy Gillespie runs in the trumpet section work. Two years later I read that that was 'bop' and the beginning of modern jazz... but the band never made recordings."
  
  Dizzy Gillespie wrote: "People talk about the Hines band being 'the incubator of bop' and the leading exponents of that music ended up in the Hines band. But people also have the erroneous impression that the music was new. It was not. The music evolved from what went before. It was the same basic music. The difference was in how you got from here to here to here...naturally each age has got its own shit."
  
  Since bebop was meant to be listened to, not danced to, it could use faster tempos. Drumming shifted to a more elusive and explosive style, in which the ride cymbal was used to keep time while the snare and bass drum were used for accents. This led to a highly syncopated music with a linear rhythmic complexity.
  
  Bebop musicians employed several harmonic devices which were not previously typical in jazz, engaging in a more abstracted form of chord-based improvisation. Bebop scales are traditional scales with an added chromatic passing note; bebop also uses "passing" chords, substitute chords, and altered chords. New forms of chromaticism and dissonance were introduced into jazz, and the dissonant tritone (or "flatted fifth") interval became the "most important interval of bebop" Chord progressions for bebop tunes were often taken directly from popular swing-era tunes and reused with a new and more complex melody or reharmonized with more complex chord progressions to form new compositions, a practice which was already well-established in earlier jazz, but came to be central to the bebop style. Bebop made use of several relatively common chord progressions, such as blues (at base, I–IV–V, but often infused with ii–V motion) and " rhythm changes " (I-vi-ii-V) – the chords to the 1930s pop standard " I Got Rhythm ". Late bop also moved towards extended forms that represented a departure from pop and show tunes.
  
  The harmonic development in bebop is often traced back to a moment experienced by Charlie Parker while performing "Cherokee" at Clark Monroe's Uptown House, New York, in early 1942. "I'd been getting bored with the stereotyped changes that were being used...and I kept thinking there's bound to be something else. I could hear it sometimes. I couldn't play it...I was working over 'Cherokee,' and, as I did, I found that by using the higher intervals of a chord as a melody line and backing them with appropriately related changes, I could play the thing I'd been hearing. It came alive." Gerhard Kubik postulates that harmonic development in bebop sprang from blues and African-related tonal sensibilities rather than 20th-century Western classical music. "Auditory inclinations were the African legacy in life, reconfirmed by the experience of the blues tonal system, a sound world at odds with the Western diatonic chord categories. Bebop musicians eliminated Western-style functional harmony in their music while retaining the strong central tonality of the blues as a basis for drawing upon various African matrices."
  
  Samuel Floyd states that blues was both the bedrock and propelling force of bebop, bringing about a new harmonic conception using extended chord structures that led to unprecedented harmonic and melodic variety, a developed and even more highly syncopated, linear rhythmic complexity and a melodic angularity in which the blue note of the fifth degree was established as an important melodic-harmonic device; and reestablishment of the blues as the primary organizing and functional principle. Kubik wrote:
  
  While for an outside observer, the harmonic innovations in bebop would appear to be inspired by experiences in Western "serious" music, from Claude Debussy to Arnold Schoenberg, such a scheme cannot be sustained by the evidence from a cognitive approach. Claude Debussy did have some influence on jazz, for example, on Bix Beiderbecke's piano playing. And it is also true that Duke Ellington adopted and reinterpreted some harmonic devices in European contemporary music. West Coast jazz would run into such debts as would several forms of cool jazz, but bebop has hardly any such debts in the sense of direct borrowings. On the contrary, ideologically, bebop was a strong statement of rejection of any kind of eclecticism, propelled by a desire to activate something deeply buried in self. Bebop then revived tonal-harmonic ideas transmitted through the blues and reconstructed and expanded others in a basically non-Western harmonic approach. The ultimate significance of all this is that the experiments in jazz during the 1940s brought back to African-American music several structural principles and techniques rooted in African traditions.
  
  These divergences from the jazz mainstream of the time met a divided, sometimes hostile response among fans and musicians, especially swing players who bristled at the new harmonic sounds. To hostile critics, bebop seemed filled with "racing, nervous phrases". But despite the friction, by the 1950s bebop had become an accepted part of the jazz vocabulary.