Browse Items (1 total) Tags: unique - Library of Congress archival sound files Browse All Browse by Tag Search Items Browse Map Sort by: Title Creator Date Added Muthallath - the triangle as a liturgical instrument in Coptic worship. Library of Congress archival sound files. Tags: Muthallath, p Triangle Index, unique - Library of Congress archival sound files, unique - triangle as liturgical instrument Featured Item Romberg’s Toy Symphony at St. James’s Hall