One of the most famous bebop trombonists was J.J. Jhonson, one of the pioneers of the bebop genre.
Who was the most famous bebop trombonist?
Is hard to give an exact answer, as there are a lot of incredible bebop trombonists, but this may refer to J. J. Jhonson.
He was from Indianapolis, Indiana, and was one of the earliest musicians that implemented the bebop style, which has its roots in jazz and swing.
He was one of the first jazz musicians who become famous in the 1940s, and also was a representative of the third wave, who mixed classical music with Jazz.
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