Document accompanying a transcription for solo euphonium and large brass ensemble of three arias, "Ecco ridente in cielo," "Largo al factotum," and "A un dottor della mia sorte," from Gioacchino Rossini's opera The Barber of Seville. Includes overviews of the arias' texts and contexts, orchestrational techniques in the transcriptions, the history and definition of the term "euphonium," and the history of the large brass ensemble in the United States.