Purdue University Fort Wayne Choral Union, Chamber Treble Singers, and University Singers, conducted by William Sauerland, sing United in Song, Prayer of St. Francis, Best Wishes, Look Down, Fair Moon, Les Papillons, Le Colibri, De colores, Patterns on the Snow, Sérénade italienne, Skin, A Green Voice, and When Thunder Comes in their concert “The Music of Mari Esabel Valverde” at Auer Performance Hall