The Ambassadors of Harmony, led by Jim Henry, director of choral studies at UMSL, will headline the concert "Voices in Harmony" June 23 at the Touhill. (Photo by August Jennewein)

Many of the world’s best a cappella voices will fill the Anheuser-Busch Performance Hall during a pair of performances June 23 at the Blanche M. Touhill Performing Arts Center at the University of Missouri–St. Louis.

The Ambassadors of Harmony, a 160-voice chorus led by Jim Henry, director of choral studies at UMSL, will headline the “Voices in Harmony” concert. A trio of the world’s top barbershop quartets will share the stage, including Crossroads, Vocal Spectrum and Musical Island Boys.

“Voices in Harmony” will begin at 2 and 8 p.m. June 23. Tickets for both shows are $24-$31. Visit touhill.org or call 314-516-4949 to order tickets.

Based in St. Charles, Mo, the Ambassadors of Harmony is the 2004 and 2009 International Champion Chorus. Its repertoire includes Broadway classics, barbershop, jazz, pop and a wide selection of holiday favorites. The nonprofit, all-volunteer chorus was originally founded in 1963 and has been under Henry’s direction for about two decades.

Henry conducts the University Singers and Vocal Point ensembles and teaches choral methods, choral arranging, choral conducting and counterpoint at UMSL. A Barbershop Harmony Society Hall of Famer as a member of the Gas House Gang quartet, he is also a member of Crossroads, winners of the International Quartet Championship for 2009 at the Barbershop Harmony Society’s annual international convention.

Vocal Spectrum is composed of members of Ambassadors of Harmony and also won the International Quartet Championship in 2006. New Zealand-based Musical Island Boys were runners-up in last year’s International Quartet Championship.