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.
https://www.ipm.org/show/nightlights/2019-09-10/individualism-gil-evans-in-the-1960s