Jimmy Knepper, a jazz trombonist best known for his
productive but stormy association with Charles Mingus.
Over the course of a career that began when he was in his
teens, Mr. Knepper was a featured soloist in countless bands,
big and small. But his reputation as one of the most original
trombonists of his generation rests largely on the music he
made with Mingus from 1957 to 1962.
Mr. Knepper's distinctively gruff sound and loose-limbed
phrasing were essential elements in some of the most
celebrated albums by Mingus, the great bassist and
composer, including ''The Clown,'' ''Tijuana Moods'' and
''Mingus Ah Um.''
The jazz critic Leonard Feather wrote that Mr