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From 1951 to 1957 he attended the Ferienkurse in Darmstadt, but he found the turn toward aleatoricism there, beginning in 1957, alien to his nature, and did not return until he was invited back in 1990.
With the growing popularity of minimalist music in the 1960s and 1970s, which often broke sharply with prevailing musical aesthetics of serialism and aleatoric music, many composers, building on the work of such minimalists as Terry Riley, Philip Glass and Steve Reich, began to work with more traditional notions of simple melody and harmony in a radically simplified framework.
He eschewed the avant-garde—his obituary in the Seattle Post-Intelligencer describes him as having "never deserted tonality" and seeing "dozens of his former avant-garde colleagues returning to the fold"—though he did embrace aleatoric techniques later in his career.