Philip Glass and Robert Wilson's most celebrated collaboration, the landmark opera Einstein on the Beach, had its premiere at the Avignon Festival in 1976. During its initial European tour, Metropolitan Opera premiere, and revivals in 1984 and 1992, Einstein provoked opposed reactions from both audiences and critics. Today, Einstein is well on the way itself to becoming a canonized avant-garde work, and it is widely acknowledged as a profoundly significant moment in the history of opera or musical theater. Einstein created waves that for many years crashed against the shores of traditional...