For 45 years, Kronos Quartet has been blazing sonic trails, expanding notions of classical and chamber music, while regularly appearing at the Walker. Though the group has commissioned more than 1,000 works by an array of international composers, their deepest and longest-lasting relationship has been with pioneering minimalist Terry Riley.

In a program celebrating Riley’s 85th birthday, Kronos honors one of American music’s most influential living composers, joined onstage by Riley (on keyboards) and his son Gyan Riley (guitar). The “genial, bearded guru of American music” (New York Times) who influenced generations of artists—from Phillip Glass and Steve Reich to the Who and Brian Eno—Riley helped drive Kronos’s polystylistic philosophy. The all-Riley program underscores his ever-evolving global aesthetic, the quartet’s distinctive approach to performance, and why they’ve been blowing minds for decades.