Series I is contained in box 1, folders 1-11, and box 2, folders 1-26; and consists of dated (1872-1933) and undated manuscript works by Beach. Many of them have dedicatory notes and autographs. Notable works include the one-act opera Cabildo, Op. 149; The Chambered Nautilus, Op. 66, a cantata for women’s voices and orchestra; and The Rainy Day, a setting of the Henry Wadsworth Longfellow poem. Also included are several works for solo piano written during the composer's childhood: Mamma’s Waltz (1872), Air and Variations (1877); Menuetto (1877); and Petite Valse (1878).