This document focuses on the formal structures and tonal language of four trios that include horn by American composer Simon A. Sargon: "Huntsman, What Quarry?" Two Poems of Edna St. Vincent Millay for Soprano, Horn, and Piano (1990); Trio for Horn, Violin, and Piano: "The Legacy" (1993); A Clear Midnight: Six Songs Set to Poems of Walt Whitman for Baritone, Horn, and Piano (1996); and Sonic Portals: Trio for Oboe, Horn, and Piano (2003). Comparisons with precedent works of like instrumentation demonstrate that Sargon's trios, though musically unique, merit a place alongside masterworks like Carl Reinecke's Trio, op. 188, for oboe, horn, and piano; Franz Schubert's Auf dem Strom for soprano, horn, and piano; and especially Johannes Brahms's Trio, op. 40, for violin, horn, and piano. Other precedent, contemporary, and related works are also mentioned. Sargon's ability to write idiomatically for the horn and other instruments is discussed, and consideration is given to some elements required to create a good performance of Sargon's chamber music. Included are a brief biography of Simon Sargon, letters from colleagues with whom he has worked closely, lists of his instrumental music and recordings of some of these pieces, and lists of other works in the genres discussed herein.