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"Jazz is a music genre that originated in the African-American communities of New Orleans, United States, in the late 19th and early 20th centuries, and developed from roots in blues and ragtime. Jazz is seen by many as 'America's classical music'. Since the 1920s jazz age, jazz has become recognized as a major form of musical expression. It then emerged in the form of independent traditional and popular music styles, all linked by the common bonds of African-American and European-American musical parentage with a performance orientation."

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"Herbert Jeffrey "Herbie" Hancock (born April 12, 1940) is an American pianist, keyboardist, bandleader, composer and actor. Starting his career with Donald Byrd, he shortly thereafter joined the Miles Davis Quintet where Hancock helped to redefine the role of a jazz rhythm section and was one of the primary architects of the post-bop sound. Hancock's music is often melodic and accessible; he has had many songs "cross over" and achieve success among pop audiences."
Herbie Hancock as mentioned is a jazz crossover musician with forays into funk, soul, pop and rock music, his classic album Headhunters was a move away from classical jazz albums and focused on substituting guitar ans bass parts with synthesizers and broke into jazz-funk. A prime example of this can be heard in the song "Chameleon" https://youtu.be/UbkqE4fpvdI

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"John William Coltrane, also known as "Trane" (September 23, 1926 – July 17, 1967), was an American jazz saxophonist and composer. Working in the bebop and hard bop idioms early in his career, Coltrane helped pioneer the use of modes in jazz and was later at the forefront of free jazz. He led at least fifty recording sessions during his career, and appeared as a sideman on many albums by other musicians, including trumpeter Miles and pianist Thelonious Monk."
Probably my favourite Jazz musician, my favorite jazz album was his collaboration with Duke Ellington and specifically the song "in a sentimental mood" https://youtu.be/sR13ECD71xU
the song captures the raw emotion with coltrane's saxophone providing the lead phrases.

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"Miles Dewey Davis III (May 26, 1926 – September 28, 1991) was an American jazz trumpeter, bandleader, and composer. He is among the most influential and acclaimed figures in the history of jazz and 20th century music. Davis adopted a variety of musical directions in his five-decade career which kept him at the forefront of a number of major stylistic developments in jazz."
Miles Davis was a trumpet virtuoso and as stated above one of the most influential characters in Jazz music ever, another Jazz legend who struggled with drug and alcohol addiction.

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"Eleanora Fagan (April 7, 1915 – July 17, 1959), better known as Billie Holiday, was an American jazz musician and singer-songwriter with a career spanning nearly thirty years. Nicknamed "Lady Day" by her friend and music partner Lester, Holiday had a seminal influence on jazz music and pop singing. Her vocal style, strongly inspired by jazz instrumentalists, pioneered a new way of manipulating phrasing and tempo. She was known for her vocal delivery and improvisational skills, which made up for her limited range and lack of formal music education."

Billie Holiday had an extremely hard life, she was practically abandoned as a child and was a prostitute by the age of 14, here life and career where ravaged by alcohol and drug addiction which eventually killed her.
Billie Holiday was a talented performer despite her troubled life, one of her most notable works was the song strange fruit which is an emotional and disturbing song about the hanging of black people in the southern states by the klu klux klan. As you can see below this performance brought Billie Holiday to tears.

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https://en.wikipedia.org/wiki/Jazz
https://en.wikipedia.org/wiki/Billie_Holiday
https://en.wikipedia.org/wiki/Herbie_Hancock
https://en.wikipedia.org/wiki/John_Coltrane
https://en.wikipedia.org/wiki/Miles_Davis