With Mingus
Knepper was twice on the receiving end of Mingus' legendary temper. Once, while onstage at a memorial concert in Philadelphia, Mingus reportedly attempted to crush his pianist's hands with the instrument's keyboard cover, then punched Knepper in the mouth. Then, on October 12, 1962, Mingus reportedly punched Knepper while the two men were working together at Mingus's apartment on a score for his upcoming concert at New York Town Hall and Knepper refused to take on more work. The blow broke one of Knepper's teeth, ruined his embouchure and resulted in the loss of the top octave of his range on the trombone for almost two years. This attack ended their working relationship and Knepper was unable to perform at the concert. Charged with assault, Mingus appeared in court in January 1963 and was given a suspended sentence. According to his daughter, Robin, Mingus also later mailed heroin to Knepper's home, and made an anonymous phone call to the police. A little girl, she remembers the police questioning her father after the mailman delivered the package. Nevertheless, in the 1970s, the two eventually reconciled enough to play together in concert and on at least one of Mingus' last albums. With Knepper, it was always about the music, and he was able to forgive and forget. Following Mingus' death, he led the Mingus Dynasty Orchestra, and toured the Middle East and Europe.
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