Background: Mal Waldron was born in New York City on August 16, 1925, to West Indian immigrants. His father was a mechanical engineer who worked on the Long Island Rail Road. The family moved to Jamaica, Queens when Mal was four years old. Waldron's parents discouraged his initial interest in jazz, but he was able to maintain it by listening to swing on the radio.
Context: Waldron went on to work with Ike Quebec in New York in 1950 and made his recording debut with the saxophonist in 1952. They played at Cafe Society Downtown on Mondays for six or seven months, which helped Waldron gain exposure and more work. Waldron worked frequently with Charles Mingus from 1954 to 1956, as part of the latter's jazz composers' workshop. He was pianist on several Mingus recordings, including Pithecanthropus Erectus, which was a key development in the movement towards freer collective improvisation in jazz. In 1955, Waldron worked with Lucky Millinder and Lucky Thompson. Waldron formed his own band in 1956, which consisted of Idrees Sulieman (trumpet), Gigi Gryce (alto saxophone), Julian Euell (bass), and Arthur Edgehill (drums). This band recorded Waldron's first release as a leader, Mal-1, in November of that year. Waldron was Billie Holiday's regular accompanist from April 1957 until her death in July 1959, including for the all-star television broadcast The Sound of Jazz. Waldron played on numerous sessions for Prestige Records from 1956 to 1958, as he was the house pianist with the label, a position he acquired after being introduced to Prestige by saxophonist Jackie McLean. Waldron appeared on several McLean-led recordings, and was praised by critic John S. Wilson for these performances as being "a consistently interesting and inventive pianist, who apparently can create fresh and provocative ideas even in the midst of a shrilling bedlam". Other leaders he worked under at Prestige included Gene Ammons, Kenny Burrell, John Coltrane, and Phil Woods. Waldron often used his own arrangements and compositions for the Prestige sessions, of which his most famous, "Soul Eyes", written for Coltrane, became a widely recorded jazz standard following its initial appearance on the 1957 album Interplay for 2 Trumpets and 2 Tenors. He composed at night at home in St. Albans between all-day recording sessions, and in a car travelling to and from the studio in Hackensack. Waldron estimated that he composed more than 400 pieces of music during his time with Prestige. After Holiday died, Waldron played with vocalist Abbey Lincoln and her husband, drummer Max Roach. Around this time, Waldron's playing on his own recordings became darker, featuring emotional shifts and variations in minor keys. In 1961, Waldron played in Eric Dolphy and Booker Little's quintet, a promising combination that ended when Little died that year, aged 23. In addition to writing for his own band and those led by others, Waldron wrote and arranged for early play-along records that were published by Music Minus One. Some of these recordings on which Waldron played were released under his name. He also wrote scores for modern ballet in the 1950s and started writing film scores in the following decade. His writing for the film The Cool World (released in 1964) was described in The Oxford Companion to Jazz as one of the first attempts to stress improvisation rather than composition in a jazz-based film score.
Question: What was his early career like?
Answer: Waldron went on to work with Ike Quebec in New York in 1950 and made his recording debut with the saxophonist in 1952.

Background: 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 Young, 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.
Context: As a young teenager, Holiday started singing in nightclubs in Harlem. She took her professional pseudonym from Billie Dove, an actress she admired, and the musician Clarence Holiday, her probable father. At the outset of her career, she spelled her last name "Halliday", the birth surname of her father, but eventually changed it to "Holiday", his performing name. The young singer teamed up with a neighbor, the tenor saxophone player Kenneth Hollan. From 1929 to 1931, they were a team, performing at clubs such as the Grey Dawn, Pod's and Jerry's on 133rd Street, and the Brooklyn Elks' Club. Benny Goodman recalled hearing Holiday in 1931 at the Bright Spot. As her reputation grew, she played in many clubs, including Mexico's and the Alhambra Bar and Grill, where she met Charles Linton, a vocalist who later worked with Chick Webb. It was also during this period that she connected with her father, who was playing in Fletcher Henderson's band. Late in 1932, at the age of 17, Holiday replaced the singer Monette Moore at Covan's, a club on West 132nd Street. The producer John Hammond, who loved Moore's singing and had come to hear her, first heard Holiday there in early 1933. Hammond arranged for Holiday to make her recording debut, at age 18, in November 1933, with Benny Goodman. She recorded two songs: "Your Mother's Son-in-Law" and "Riffin' the Scotch", the latter being her first hit. "Son-in-Law" sold 300 copies, but "Riffin' the Scotch", released on November 11, sold 5,000 copies. Hammond was impressed by Holiday's singing style and said of her, "Her singing almost changed my music tastes and my musical life, because she was the first girl singer I'd come across who actually sang like an improvising jazz genius." Hammond compared Holiday favorably to Armstrong and said she had a good sense of lyric content at her young age. In 1935, Holiday had a small role as a woman abused by her lover in Duke Ellington's short Symphony in Black: A Rhapsody of Negro Life. In her scene, she sang "Saddest Tale".
Question: what music did she produce?
Answer:
Hammond arranged for Holiday to make her recording debut, at age 18, in November 1933,