The Chicago Symphony Orchestra (CSO) is an American symphony orchestra based in Chicago, Illinois. Founded by Theodore Thomas in 1891, the ensemble has been based in the Symphony Center since 1904 and plays a summer season at the Ravinia Festival. The orchestra's most recent music director is Riccardo Muti, whose tenure spanned 13 seasons, from 2010–2023. The CSO is one of the American orchestras commonly referred to as the "Big Five".

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