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Jazz fusion (often simply called "fusion") blends the improvisational language and harmonic richness of jazz with the amplified instruments, grooves, and song forms of rock, funk, and R&B. It typically features electric guitars, electric bass or fretless bass, Rhodes electric piano, clavinet, analog and digital synthesizers, and a drum kit playing backbeat- and syncopation-heavy patterns. Hallmarks include extended chords and modal harmony, complex and shifting meters, brisk unison lines, virtuosic improvisation, and a production aesthetic that embraces effects processing and studio craft. The style ranges from fiery, aggressive workouts to polished, atmospheric textures, often within the same piece. Emerging in the late 1960s and flourishing through the 1970s, jazz fusion became a bridge between jazz audiences and rock/funk listeners, shaping later styles such as jazz-funk, smooth jazz, nu jazz, and parts of progressive and technical rock/metal.

Experimental big band is a forward-looking offshoot of the jazz big band tradition that applies avant‑garde composition, free improvisation, and nonstandard orchestrations to the classic large‑ensemble format. While it often retains a core lineup of saxophones, trumpets, trombones, and rhythm section, it commonly expands the palette with woodwind doublings, strings, electronics, unconventional percussion, and voice. Harmony ranges from extended tonal and modal writing to polytonality and atonality, often employing quartal/quintal harmony, tone clusters, and timbral (color‑based) harmonies. Rhythm favors odd meters, polyrhythms, metric modulation, and groove/texture hybrids. Forms may be through‑composed, modular, or suite‑like, and pieces frequently integrate conducted or cued improvisation, graphic notation, and other experimental score practices. Rather than a single codified style, experimental big band functions as an umbrella for large ensembles that push beyond swing and post‑bop arranging by drawing on contemporary classical approaches, free jazz, minimalism, electronics, and global traditions.

Vocal jazz is a jazz tradition in which the human voice is treated as an instrument—matching the phrasing, articulation, and timbral nuance of horns or piano. Singers often improvise melodically and rhythmically, including using scat singing (nonsense syllables) to emulate instrumental solos. At the same time, many vocal‑jazz performances favor traditional, pop‑leaning song structures and clear lyric delivery, reducing the overall role of extended improvisation compared with small‑group instrumental jazz. Repertoires frequently draw from Tin Pan Alley and Broadway standards (the Great American Songbook), rendered with swing, ballad, or Latin feels.

Jazz is an improvisation-centered music tradition that emerged from African American communities in the early 20th century. It blends blues feeling, ragtime syncopation, European harmonic practice, and brass band instrumentation into a flexible, conversational art. Defining features include swing rhythm (a triplet-based pulse), call-and-response phrasing, blue notes, and extended harmonies built on 7ths, 9ths, 11ths, and 13ths. Jazz is as much a way of making music—spontaneous interaction, variation, and personal sound—as it is a set of forms and tunes. Across its history, jazz has continually hybridized, from New Orleans ensembles and big-band swing to bebop, cool and hard bop, modal and free jazz, fusion, and contemporary cross-genre experiments. Its influence permeates global popular and art music.