The purpose of this study is to explore the literature for textless voice and woodwind instruments. The primary focus concerns the timbral and ensemble possibilities exploited in three twentieth-century works in which the voice is treated as an instrument i.e., without the usual preoccupation with textual meaning. An historical overview of vocal works with obbligato woodwinds and concerted works for textless voice serves as an introductory chapter. The variables of voice and instrument acoustical makeup, vocal vowel formation and instrumental voicings, volume, vibrato, resultant tones, range, and extended techniques (fluttertongue, special vibrato demands, non-vibrato, etc.) are the focus of the performance considerations for this study. Over thirty twentieth-century textless works for voice and at least one woodwind instrument were located. The three, chosen for this study represent different periods in the century, and present contrasting styles and musical merit: Aria (1931) by Jacques Ibert, Three Vocalises (1958) by Ralph Vaughan Williams, and Duos I (1976) by Nancy Chance. A style and performance analysis of these works with pertinent research on the composers is presented. Appendices include an annotated bibliography of selected works for the medium, a written interview with Nancy Chance, and performance notes provided by the composer, concerning Duos I.