The emergence of Jack Teagarden as an important jazz stylist was a significant feature of the '20s jazz scene. He brought a maturity to the sound of the trombone and until late in his life played with a laconic grace that few, if any, on his instrument have equaled. His collaboration with Louis Armstrong-who rated their musical relationship higher than any he had known-was one of the great partnerships in jazz history. The story of this funny, happy...