Gil Evans, a Canadian-born pianist and composer, enormously expanded the vocabulary of the jazz orchestra," as writer Gene Lees pointed out, reducing the standard big-band instrumentation, restraining its vibrato, and adding flutes, oboes, English and French horns, and tubas. Self-taught as an arranger, he created a quietly dramatic, dark-hued sound-world that drew on a multiplicity of influences ranging from Spanish music and the French Impressionists to Duke Ellington and...