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In page Ruth Laredo:

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Laredo also played contemporary music, mainly in the beginning of her career in Marlboro. This was something Pablo Casals – who did not like music beyond the era of Brahms – disapproved of. He would stay home when Leon Kirchner would come to Marlboro for a performance.[10]: 277  In the 1983/1984 season she played the world premiere of Peter Martins's work called Waltzes with the New York City Ballet.[10]: 275  In 1989 she played Wallingford Riegger's twelve-tone Variations for Piano and Orchestra at Carnegie Hall with the American Composers Orchestra under Paul Lustig Dunkel.[11] Her repertoire included also works by Franz Liszt, Arnold Schoenberg, Béla Bartók, Anton Webern and Alban Berg.[citation needed]