1957—Present 
Founded by Tony Butala, The Lettermen had scores of hit recordings, including “Going Out Of My Head”, “The Way You Look Tonight”, and “Put Your Head On My Shoulder”.  

1972—Present 
Founded by Tim Hauser, The Manhattan Transfer has been one of the world’s most influential vocal groups in the genres of jazz and pop. Today’s line-up includes Cheryl Bentyne, Alan Paul, Janis Siegel, and Trist Curless. 

1992—Present 
A German male a cappella quartet consisting of Oliver Gies, Jan Malte Bürger, Lukas Teske and Sebastian Schröder.  

2006—Present
Maytree is the a cappella South Korean vocal quintet. The fivesome performs in a variety of vocal genres from classical to contemporary pop.

1988—Present
New York Voices explores a repertoire that includes the vocalese traditions of bop and adaptations from the jazz and pops world. Members include Darmon Meader, Peter Eldridge, Lauren Kinhan, and Kim Nazarian.

A trio dedicated to studying and celebrating of Eastern Europe and the Balkans. The trio is comprised of Nila Bala, Sarah Larsson, and Rachel LaViola. 

The vocal threesome (Lorie, Kurt, and Terrence Niska) is comprised of two brothers and a husband and wife team. The Niskas were also the core members of Five By Design. 

BYU Noteworthy is a nine-member, female Brigham Young University a cappella group, based in Provo, Utah. The group appeared on the first season of NBC's The Sing-Off in 2009.

Established in 2004, The O-Kai Singers are a Taiwanese vocal quartet The group has toured Beijing, Shanghai, Hong Kong, South Korea, Japan, Canada, France, Germany, United Kingdom, Finland, the Philippines

Led by choral director, J.D. Frizzell, One Voice is the contemporary a cappella vocal ensemble at Briarcrest Christian High School in Memphis, Tennessee. Credits include winning Macy’s A Cappella Challenge, NBC’s The Sing-Off, the Emmy Governor’s Ball. 

Rio de Janeiro, Brazil
Ordinarius combines vocals with Brazilian percussion and the vocal arrangements of its founder, Augusto Ordine. The music features the choro, baião, samba and ijexá rhythms of Brazilian percussion and the vocals of the sextet.
 

Brian Parrish leads the Parkway West vocal program in Ballwin, Missouri.