This project discusses the horn, tuba, piano sub-genre of brass chamber music. Alec Wilder wrote the first piece for this instrumentation in 1963 for his friends John Barrows and Harvey Phillips. Wilder's compositional style was directly affected by life events and relationships. Through letters, biographies, recordings and autobiographies the importance of his friendship with Barrows and Phillips are displayed to show the links between the two men and the composer's compositional output. A deeper look into the life of Alec Wilder and a thematic analysis of his Suite No.1 for Horn, Tuba and Piano (1963), and Suite No.2 for Horn, Tuba and Piano (1971) shed light on the beginnings of the genre and provide a deeper understanding of the works. Since Wilder's two trios there have been at least twenty works written for this instrumentation. A brief overview of works written for the trio since 1971 provide a broad sense of the quantity and benefits of the trio in the hopes of inspiring new performances and compositions. This paper will combine the seemingly random compositions for the instrumentation into a collected repertoire. With an increase in exposure, the trio for horn, tuba and piano has the potential to become a standard brass chamber group that will benefit students, performers, and audiences alike.