Bebop or bop is a style of jazz developed in the early to mid-1940s in the United States. It is characterized by a fast tempo, complex chord progressions—with rapid chord changes, changes of key, angular melodies and substitute chords—along with virtuosic improvisation based on a combination of harmonic structure, scales, and occasional references to the melody.
Bebop developed as the younger generation of jazz musicians expanded the creative possibilities of jazz beyond the popular, dance-oriented swing music-style to a new "musician's music" that was not as danceable and demanded close listening.Lott, Eric. Double V, Double-Time: Bebop's Politics of Style. Callaloo, No. 36 (Summer, 1988), pp. 597–605 As bebop was not intended for dancing, it enabled the musicians to play at faster tempos. Bebop musicians explored advanced harmonies, complex syncopation, altered chords, extended chords, chord substitutions, asymmetrical phrasing, and intricate melodies. Bebop groups used rhythm sections in a way that expanded their role. Whereas the key ensemble of the swing music era was the big band of 16–18 musicians playing in an ensemble-based style, the classic bebop group was a small combo that consisted of saxophone (alto or tenor), trumpet, piano, guitar, double bass, and drums playing music in which the ensemble played a supportive role for soloists. Rather than play heavily arranged music, bebop musicians typically played the melody of a composition (called the "head") with the accompaniment of the rhythm section, followed by a section in which each of the performers improvised a solo, then returned to the melody at the end of the composition.
Some of the most influential bebop artists, who were typically composer-performers, are alto sax players Charlie Parker and Sonny Stitt; tenor sax players Dexter Gordon, Sonny Rollins, and James Moody; clarinet player Buddy DeFranco; trumpeters Fats Navarro, Miles Davis, and Dizzy Gillespie; pianists Bud Powell, Barry Harris and Thelonious Monk; trombonist J.J. Johnson; electric guitarist Charlie Christian; and drummers Kenny Clarke, Max Roach, and Art Blakey.
Etymology
The term "bebop" is derived from nonsense syllables (vocables) used in scat singing; the first known example of "bebop" being used was in McKinney's Cotton Pickers' "Four or Five Times", recorded in 1928.Gleason, Ralph J. (15 February 1959) "Jazz Fan Really Digs the Language – All the Way Back to Its Origin" . Toledo Blade. It appears again in a 1936 recording of "I'se a Muggin'" by Jack Teagarden. A variation, "rebop", appears in several 1939 recordings. The first known print appearance also occurred in 1939, but the term was little used subsequently until applied to the music now associated with it in the mid-1940s. Thelonious Monk claims that the original title "Bip Bop", for his composition better known as "52nd Street Theme", was the origin of the name "bebop".
Some researchers speculate that it was a term used by Charlie Christian because it sounded like something he hummed along with his playing.Jim Dawson and Steve Propes, What Was The First Rock'n'Roll Record?, 1992, Dizzy Gillespie stated that the audiences coined the name after hearing him scat the then-nameless compositions to his players and the press ultimately picked it up, using it as an official term: "People, when they'd wanna ask for those numbers and didn't know the name, would ask for bebop." Another theory is that it derives from the cry of "Arriba! Arriba!" used by Latin American bandleaders of the period to encourage their bands.Peter Gammond, The Oxford Companion to Popular Music, 1991, At times, the terms "bebop" and "rebop" were used interchangeably. (Although rebop differed from bebop with its more impressionist use of discordant chords.) By 1945, the use of "bebop"/"rebop" as nonsense syllables was widespread in R&B music, for instance Lionel Hampton's "Hey! Ba-Ba-Re-Bop". The bebop musician or bopper became a stock character in jokes of the 1950s, overlapping with the beatnik.
Instrumentation
The classic bebop combo consisted of saxophone, trumpet, double bass, drums and piano. This was a format used (and popularized) by both Parker (alto sax) and Gillespie (trumpet) in their 1940s groups and recordings, sometimes augmented by an extra saxophonist or guitar (electric or acoustic), occasionally adding other horns (often a trombone) or other strings (usually violin) or dropping an instrument and leaving only a quartet. This was in stark contrast to the large ensembles favored during the swing era.
Musical style Bebop differed drastically from the straightforward compositions of the swing era and was instead characterized by fast tempos, asymmetrical phrasing, intricate melodies, and rhythm sections that expanded on their role as tempo-keepers. The music itself seemed jarringly different to the ears of the public, who were used to the bouncy, organized, danceable compositions of Benny Goodman and Glenn Miller during the swing era. Instead, bebop appeared to sound racing, nervous, erratic and often fragmented.
While swing music tended to feature orchestrated big band arrangements, bebop music highlighted improvisation. Typically, a theme (a "head", often the main melody of a pop or jazz standard of the swing era) would be presented together at the beginning and the end of each piece, with improvisational solos based on the chords of the compositions. Thus, the majority of a piece in bebop style would be improvisation, the only threads holding the work together being the underlying harmonies played by the rhythm section. Sometimes improvisation included references to the original melody or to other well-known melodic lines ("quotes", "licks" or "riffs"). Sometimes they were entirely original, spontaneous melodies from start to finish.
Chord progressions for bebop compositions were often taken directly from popular swing-era compositions and reused with a new and more complex melody, forming new compositions (see contrafact). This practice was already well-established in earlier jazz, but came to be central to the bebop style. The style made use of several relatively common chord progressions, such as blues (at base, I-IV-V, but 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 compositions. Bebop chord voicings often dispensed with the root and fifth tones, instead basing them on the leading intervals that defined the tonality of the chord. That opened up creative possibilities for harmonic improvisation such as tritone substitutions and use of diminished scale based improvised lines that could resolve to the key center in numerous and surprising ways.
Bebop musicians also employed several harmonic devices not typical of previous jazz. Complicated harmonic substitutions for more basic chords became commonplace. These substitutions often emphasized certain dissonant intervals such as the flat ninth, sharp ninth or the sharp eleventh/tritone. This unprecedented harmonic development which took place in bebop is often traced back to a transcendent moment experienced by Charlie Parker while performing "Cherokee" at Clark Monroe's Uptown House, New York, in early 1942. As described by Parker:Kubik, Gerhard. "Bebop: a case in point. The African Matrix in Jazz Harmonic Practices." (Critical essay) Black Music Research Journal 22 Mar 2005. Digital.
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 the harmonic development in bebop sprang from the blues, and other African-related tonal sensibilities, rather than twentieth century Western art music, as some have suggested. Kubik states: "Auditory inclinations were the African legacy in [Parker's] 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 were both the bedrock and propelling force of bebop, bringing about three main developments: 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. The reestablishment of the blues as the music's primary organizing and functional principle.Floyd, Samuel A., Jr. (1995). The power of black music: Interpreting its history from Africa to the United States. New York: Oxford University Press.
Some of the harmonic innovations in bebop appear similar to innovations in Western "serious" music, from Claude Debussy to Arnold Schoenberg, although bebop has few direct borrowings from classical music and appears to largely revive tonal-harmonic ideas taken from the blues in a basically non-Western approach rooted in African traditions. However, bebop probably drew on many sources. An insightful YouTube video with Jimmy Raney, a jazz guitarist who played with Charlie Parker, describes how Parker would listen to the music of Béla Bartók, a leading 20th century classical composer. Raney describes Parker's knowledge of Bartók and Arnold Schoenberg, in particular Schoenberg's Pierrot Lunaire, and says that a section from Bartók's Fifth Quartet sounded a lot like some of Parker's jazz improvisation.Raney, Jimmy and Jamey Abersold. "Jimmy & Jamey Discuss Charlie Parker", https://www.youtube.com/watch?v=10guXUWGGB4
History
Swing era influences
Bebop grew out of the culmination of trends that had been occurring within swing music since the mid-1930s: less explicit timekeeping by the drummer, with the primary rhythmic pulse moving from the bass drum to the ride cymbal; a changing role for the piano away from rhythmic density towards accents and fills; less ornate horn section arrangements, trending towards riffs and more support for the underlying rhythm; more emphasis on freedom for soloists; and increasing harmonic sophistication in arrangements used by some bands. "One of the greatest revolutions of 1940s jazz is the relationship between the interpretative act and the compositional act." Elisabeta Campău-Firtescu, "Jazzul anilor 1940 în spațiul nord-american", Editura Artes, Iaşi, 2025, p. 104. The path towards rhythmically streamlined, solo-oriented swing was blazed by the territory bands of the southwest with Kansas City as their musical capital; their music was based on blues and other simple chord changes, riff-based in its approach to melodic lines and solo accompaniment, and expressing an approach adding melody and harmony to swing rather than the other way around. Ability to play sustained, high energy, and creative solos was highly valued for this newer style and the basis of intense competition. Swing-era jam sessions and "cutting contests" in Kansas City became legendary. The Kansas City approach to swing was epitomized by the Count Basie Orchestra, which came to national prominence in 1937.