The Incredible Chet Baker Plays and Sings Recorded in 1977

Post-bop is a modern jazz style that emerged in the early-to-mid 1960s as a synthesis of bebop, hard bop, modal jazz, cool jazz, third stream ideas, and the experimental impulses of the avant‑garde. It typically features acoustic small ensembles (often trumpet, saxophone, piano, bass, and drums) interacting with highly flexible time, non-functional or modal harmony, and motivic development rather than relying strictly on bebop chord cycles. Its sound balances structure and freedom: forms are clearly composed and often intricate, but improvisers stretch time feels, reharmonize on the fly, and use advanced harmonic colors such as quartal voicings, pedal points, and chromatic planing. Canonical touchstones include Miles Davis’s mid‑’60s Second Great Quintet (e.g., E.S.P., Nefertiti), Wayne Shorter’s Speak No Evil, Herbie Hancock’s Maiden Voyage, Andrew Hill’s Point of Departure, and many mid‑’60s Blue Note recordings that pushed beyond hard bop.

Cool jazz is a modern jazz style marked by relaxed tempos, lighter tone, and a focus on arrangement, counterpoint, and timbral clarity. It favors understatement over virtuoso display and uses dynamics, space, and balance to create an airy, "cool" ambience. Emerging in the late 1940s, the style drew on bebop’s harmonic sophistication while smoothing its angular edges, often incorporating classical techniques such as linear writing and orchestral color. Hallmarks include brushed drums, lyrical improvisation, careful voice-leading, and unusual instrumentation (for jazz) like French horn and tuba alongside trumpet, saxophones, trombone, piano, bass, and drums. Although associated with the U.S. West Coast in the 1950s, cool jazz originated in New York through sessions led by Miles Davis and arranged by Gil Evans and others. It went on to influence bossa nova, third stream, modal jazz, and later smooth jazz and lounge aesthetics.

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.