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His links with Bartók continued for many years: he conducted the world premiere of Bartók's Viola Concerto, as completed by Tibor Serly, with the Minneapolis Symphony Orchestra in 1949, with William Primrose as the soloist.
In January 2007, Marks performed the World Premiere of Steven Gellman's Viola Concerto with the Ottawa Symphony Orchestra to critical acclaim.
In 1995, he conducted the first performance of his Cello Concerto with the Portuguese National Symphony Orchestra in Lisbon and, in 1997, his Viola Concerto with Garth Knox and the Nuremberg Symphony Orchestra.
Cleveland Orchestra principal violist Robert Vernon gave the world premiere of Schoenfield's viola concerto in 1998.