This document discusses three 20th century classical works that incorporate extended vocal techniques: Berio's Circles for soprano and instruments features Cathy Berberian performing vocal sounds to accompany an e.e. cummings text; Crumb's Ancient Voices of Children sets Federico García Lorca poems for unusual vocal and instrumental combinations including toy piano and musical saw, exploring Lorca's concept of "duende"; and Berberian's own Stripsody experiments with the human voice.