 Anuna (2)
- Ars Nova Singers
 - specialises in a cappella music of the Renaissance and the 20th century. - Camerata Nova
- Choral ensemble dedicated to the exploration and performance of cappella Renaissance music.
- Chanticleer (2)
- Chicago a cappella
- Ensemble of nine voices who deliver a rare combination: the emotional power of soloists and the well-tuned blend of polished ensemble singers.
- English Renaissance
- Group that specialises in unaccompanied choral music from the renaissance to the present day.
- Ensemble Amarcord
- Provides information on the classical a cappella group.
- Esoterics, The
- Performing 20th-century a cappella choral music, with the goal of unearthing and performing challenging choral works, as well as commissioning new works.
- Georgetown University Chamber Singers
- Classical a cappella group performing works from the Renaissance through the present.
- Harmony Sweepstakes A Cappella Festival
- Annual nationwide competition for vocal harmony a cappella groups of all styles.
- Larksong
- A cappella group specialising in Renaissance music.
- MidWestern Wind
- Chicago-based performance group composed of mostly Northwestern University medical and law students.
- Octave Vocal Ensemble
- Suffolk-based a cappella group performing 16th-21st century serious and light music.
- Orlando Consort@
- Peacock's Feather
- Vocal ensemble singing Russian and western European choral music.
- Piping Rock Singers
- Specialises in music of the Renaissance and early Baroque periods. Performs in period costumes at Houston parties, weddings, event openings, and the Texas Renaissance Festival.
- Pittsburgh Camerata
- Pittsburgh A Capella choir. Featuring: A Christmas Mosaic - our first CD Performing 3 times per year in the Pittsburgh area.
- Summa Musica
- A capella choir performing interesting unaccompanied works of any era.
- Voices USA!
- A cappella ensemble specialising in patriotic, Americana, ragtime, and folk music performed in period costumes. Based in North Virginia, and the Washington, D.C. metro area.
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