Kohn's own works have been performed by the Los Angeles Philharmonic and Buffalo Philharmonic Orchestras, the Oakland Symphony, the Saint Paul Chamber Orchestra, on the San Francisco Symphony's Musica Viva series, at the Monday Evening Concerts in Los Angeles (Kohn served for two decades on the board of directors of the Monday Evening Concerts), and in concerts and broadcasts throughout the United States and abroad.
In the 1960s, the orchestra was noted for its commitment to new music under music director Gerhard Samuel, giving local and world premieres by such composers as Darius Milhaud, Luciano Berio, Karlheinz Stockhausen, and Hans Werner Henze.
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He was the conductor of the Oakland Symphony Orchestra 1955-1959 and the Oregon Symphony (then the Portland Symphony Orchestra) 1959-1961.