Polyrock was an American rock band formed in New York City in 1978 and active until the mid-1980s. Strongly influenced by minimalism, the group was produced by the composer Philip Glass and Kurt Munkacsi. The band, led by singer/guitarist Billy Robertson (formerly of the group Model Citizens), had a keyboard-heavy, pattern-based sound strongly reminiscent of Glass's work; in fact, Glass performed on their first two albums. Polyrock's lineup also included vocalist Catherine Oblasney