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Leonard Slatkin

Associated Press, Carlos Osorio

Detroit Symphony Orchestra musical director Leonard Slatkin leads a rehearsal on April 7, 2011, in Detroit. 

When 8 p.m. Saturday, 3 p.m. Sunday • Where Powell Symphony Hall, 718 North Grand Boulevard • How much $25-$112 • More info 314-534-1700; slso.org

It’s been a half-century since conductor Leonard Slatkin made his debut with the St. Louis Symphony Orchestra; this weekend and next, the SLSO celebrates with a pair of programs conducted by the man who’s now the orchestra’s conductor laureate. This weekend’s concerts feature Russian pianist and Van Cliburn Piano Competition gold medalist Olga Kern in Rachmaninoff’s Piano Concerto No. 1, and Bernstein’s Symphony No. 3, “Kaddish,” dedicated to President John F. Kennedy, with narrator Charlotte Blake Alston, mezzo-soprano Sasha Cooke, the St. Louis Symphony Chorus and the St. Louis Children’s Choirs. Also on the program: Loren Loiacono’s 2017 work “Smothered by Sky.” By Sarah Bryan Miller