Peter Rasmussen Hallock (November 19, 1924, Kent, Washington – April 27, 2014, Fall City, Washington) was an American organist, choirmaster, liturgist, countertenor, and composer and arranger of church music (anthems, hymns, psalm settings, and music for the Episcopal liturgy). Though he occasionally gave concerts, lectures, and seminars around the United States, his career was centered in Seattle, Washington. From 1951 to 1991 he served as organist and choirmaster at St. Mark's Cathedral, Seattle, during which he was conferred the title of Canon Precentor, the first layperson in the Episcopal Church (United States) to be so honored. Later, he served as organist at St. Clements (Seattle) until 2013. He also founded the Compline Choir from its predecessor chant study group in 1956; he led t