Jazz Glossary
A comprehensive guide to essential jazz terminology, genres, techniques, and key figures. Understanding these terms will deepen your appreciation of jazz music and its rich history.
Albums
Elastic Rock
Elastic Rock is the debut studio album by Ian Carr's Nucleus, released in 1970 on Vertigo Records. Recorded after the band won the top prize at the Montreux Jazz Festival, it is considered one of the landmark albums of British jazz fusion. The album features a blend of jazz improvisation, rock energy, and experimental composition that was groundbreaking for its time. The original Vertigo pressing has become a highly sought-after collector's item.
Artists & Groups
Nucleus
Nucleus (also known as Ian Carr's Nucleus or Ian Carr with Nucleus) was a pioneering British jazz-rock fusion band active from 1969 to 1989. Founded by trumpeter Ian Carr in London, the band won the top prize at the 1970 Montreux Jazz Festival and released 12+ studio albums on Vertigo Records and Capitol Records. Notable members included Karl Jenkins, Chris Spedding, John Marshall, Allan Holdsworth, and Brian Smith. Nucleus was one of the first British groups to fuse jazz with rock and electronic elements.
Ian Carr
Ian Carr (21 April 1933 – 25 February 2009) was a British jazz trumpeter, composer, author, and educator. He was the founder and leader of the jazz fusion band Nucleus from 1969 to 1989. Before Nucleus, he played in the Don Rendell/Ian Carr Quintet. Carr was also a distinguished writer, authoring biographies of Miles Davis and Keith Jarrett, and co-authoring The Rough Guide to Jazz. He served as associate professor at the Guildhall School of Music and Drama from 1987.
Soft Machine
Soft Machine was an English rock band formed in Canterbury in 1966 that evolved from psychedelic pop into one of the most important jazz-rock fusion groups in British music. The band shared approximately ten musicians with Nucleus over the years, creating a network of interconnected projects that defined British jazz fusion. Key members included Robert Wyatt, Mike Ratledge, Hugh Hopper, and later Karl Jenkins and John Marshall (both also members of Nucleus).
Events & Venues
Montreux Jazz Festival
The Montreux Jazz Festival is an annual music festival held in Montreux, Switzerland, on the shores of Lake Geneva. Founded by Claude Nobs in 1967, it is one of the most prestigious jazz festivals in the world. The festival holds special significance in jazz fusion history: Nucleus won the top group prize at the 1970 festival, which helped launch their career. The festival celebrates its 60th anniversary in 2026.
Genres
Jazz Fusion
Jazz fusion (also known as jazz-rock fusion) is a music genre that developed in the late 1960s when musicians combined jazz harmony and improvisation with rock music, funk, and rhythm and blues. Key pioneers include Miles Davis, Herbie Hancock, Weather Report, Mahavishnu Orchestra, and British groups like Nucleus and Soft Machine. The genre is characterized by electric instruments, complex time signatures, and extended improvisation over rock and funk rhythms.
Bebop
Bebop (or bop) is a style of jazz developed in the early to mid-1940s in the United States. It features fast tempos, complex chord progressions with rapid chord changes, virtuosic instrumental technique, and improvisation based on harmonic structure rather than melody. Key innovators include Charlie Parker, Dizzy Gillespie, Thelonious Monk, and Bud Powell. Bebop marked jazz's shift from dance music to an art form focused on musicianship and creative expression.
Modal Jazz
Modal jazz is an approach to jazz that uses musical modes (scales) rather than chord progressions as the harmonic framework for improvisation. Popularized by Miles Davis's 1959 album 'Kind of Blue' and John Coltrane's explorations, modal jazz gives improvisers more freedom by reducing the number of chord changes and allowing them to explore a mode at length. This approach opened the door to more spacious, meditative improvisation.
Free Jazz
Free jazz is an approach to jazz that emerged in the late 1950s and 1960s, characterized by the abandonment of fixed chord changes, meter, and sometimes tonal center. Pioneered by Ornette Coleman, Cecil Taylor, and Albert Ayler, free jazz emphasizes collective improvisation, extended techniques, and the exploration of sound textures. The genre challenged conventional notions of what constitutes music and expanded the boundaries of jazz expression.
Jazz-Rock
Jazz-rock is a subgenre of jazz fusion that specifically emphasizes the combination of jazz improvisation with rock rhythms, electric guitars, and high-energy performance. While the term is sometimes used interchangeably with jazz fusion, jazz-rock typically refers to the more rock-oriented end of the fusion spectrum. Nucleus was described as one of England's first electronic jazz-rock fusion groups when they formed in 1969.
Labels
Vertigo Records
Vertigo Records is a British record label founded in 1969 as a subsidiary of Philips Records (later PolyGram, now Universal Music). The label was home to many progressive rock and jazz fusion artists, including Nucleus, who released their first eight albums on the label between 1970 and 1975. Original Vertigo pressings, identifiable by their distinctive swirl label design, have become highly collectible, with first pressings of jazz fusion albums selling for four-figure sums.
Techniques
Improvisation
Improvisation in jazz is the spontaneous creation of music in real time during a performance. Unlike composed music, improvised passages are created on the spot, with musicians drawing on their knowledge of harmony, melody, rhythm, and the musical context to create new musical ideas. Jazz improvisation typically occurs over a harmonic framework (chord changes) and involves a conversation between musicians who listen and respond to each other in real time.
Multiphonics
Multiphonics is an extended technique used on wind instruments where the player produces two or more notes simultaneously. On brass instruments like the trumpet, this is achieved by simultaneously singing (or humming) one note while playing another, creating complex harmonic interactions. In jazz, multiphonics add textural richness and are increasingly used by contemporary trumpeters and saxophonists as part of their improvisational vocabulary.
Extended Techniques
Extended techniques are unconventional methods of playing a musical instrument that go beyond standard practice to produce unusual sounds and effects. In jazz, common extended techniques include multiphonics, circular breathing, prepared instruments (placing objects in or on the instrument), flutter-tonguing, and overtone manipulation. These techniques expand the timbral palette available to improvisers and are increasingly integrated into mainstream jazz performance.
Head Arrangement
A head arrangement in jazz is a musical arrangement that is worked out collectively by the musicians rather than written down by an arranger. The term 'head' refers to a composition's melody, which is typically played at the beginning and end of a performance, with improvisations in between. Head arrangements allow for flexibility and spontaneity, and were a key feature of many small-group jazz performances.
Comping
Comping (short for accompanying or complementing) is the technique used by rhythm section instruments — piano, guitar, vibraphone, or organ — to provide harmonic and rhythmic support to a soloist in jazz. Good comping involves voicing chords in interesting ways, creating rhythmic variety, responding to and inspiring the soloist, and contributing to the overall groove. It is both a supportive and a creative role.
Theory
Chord Changes
Chord changes (also called 'changes') refer to the harmonic progression that forms the structural basis of a jazz composition. Jazz musicians improvise over these chord changes, creating melodic lines that navigate the shifting harmonic landscape. The ability to improvise fluently over complex chord changes is a fundamental skill in jazz, requiring deep knowledge of harmony, voice leading, and melodic construction.
Standard
A jazz standard is a musical composition that is widely known, performed, and recorded by jazz musicians. Standards form the common repertoire that jazz musicians are expected to know, drawn from Tin Pan Alley songs, Broadway musicals, Great American Songbook compositions, and original jazz compositions. Knowledge of standards allows musicians who have never played together to perform without rehearsal, as they share a common musical vocabulary.
Swing
Swing in jazz refers to both a specific era of jazz (the Swing Era, roughly 1935-1945) and a rhythmic feel that is fundamental to jazz performance. The swing feel involves a characteristic rhythmic treatment of eighth notes where they are played with an uneven, lilting quality rather than straight. This rhythmic feel creates the sense of forward momentum and groove that distinguishes jazz from other forms of music.
Blue Note
A blue note is a note sung or played at a slightly lower pitch than the major scale for expressive purposes. Blue notes, typically the flattened third, fifth, or seventh degrees of the scale, are a defining characteristic of blues and jazz music. The term also refers to Blue Note Records, the iconic jazz record label founded in 1939, which has been home to many of the genre's most important recordings.
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