The Saint Louis Symphony Orchestra (SLSO) is a major United States symphony orchestra based in St. Louis, Missouri. Founded in 1880, it is the second-oldest U.S. symphony, after the New York Philharmonic. Based in Powell Symphony Hall, it performs an annual Carnegie Hall concert and makes regular overseas tours. It records on its own label, Arch Media, and has received six Grammy Awards and fifty-six nominations. The symphony has an extensive educational program; its members give some 350 free performances a year in schools and other educational settings.

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