LEWISTON – Six a cappella groups will sing out in harmony Saturday, Nov. 3, at the 14th annual Battle of the Blends fundraiser for the Maine Music Society.

Performing will be the Boston Jazz Voices, Downtown Crossing, Fretless, The Maine Steiners, The Royal River Chorus and Undertone. The concert will begin at 7:30 p.m. at the Franco-American Heritage Center, 46 Cedar St.

Boston Jazz Voices, founded in the 1980s, originally sang arrangements written by Gene Puerling, who sang with the Hi-Lo’s, an all-male, close-harmony group from the 1950s and ’60s. With an extended repertoire including other published and original arrangements, Boston Jazz Voices performs songs from the American songbook with jazz harmonies and swing rhythms throughout New England. The group has also performed in Paris and live on 88.9 WERS Boston.

Also from Boston, Downtown Crossing is a well-established vocal band specializing in original songs and innovative, high-energy covers of alternative, modern rock, and rhythm and blues tunes.

Fretless weaves the soprano, alto, tenor, baritone and bass voices of five accomplished performers into a tapestry of harmonies and lyrics. Their repertoire includes an adventurous mix of lively pop songs, Broadway classics, demanding classical works and off-beat selections from the great American songbook.

The University of Maine’s oldest a cappella group, the Maine Steiners, started in the 1950s and has won international acclaim. The ensemble of 10 men has produced more than six CDs. They have traveled across the globe as far as Budapest and Venice to promote a cappella music. Most of the time, they sing for high schools in New England to encourage music in schools. The group is known for its tight harmonies and diverse repertoire.

The Royal River Chorus is a chapter of Sweet Adelines International, the world’s largest music education association for women singers. Sweet Adelines is dedicated to the promotion of a cappella, four-part harmony in the barbershop-style, an original American art form. The organization has more than 30,000 members worldwide. The Royal River Chapter was chartered in Yarmouth in 1983 by 12 experienced Sweet Adelines. In recent years, the chorus has maintained standings within the top five at the annual Region One competition in Springfield, Massachusetts.

Undertone is a dynamic addition to Boston’s semi-pro a cappella scene, with its assortment of alumni from different college groups in the area. As the graduates broke into the “real” world, they realized their jobs in information technology, investment banking and other fields didn’t offer opportunities to fulfill their rock-star fantasies. Hence the birth of Undertone in 2004. Their repertoire consists of random songs that usually include current and old-school pop, rock and R&B. Undertone performs throughout Boston on street corners, in middle schools and colleges, and at local bars.

Tickets, $20, are available through L/A Arts at 782-7228. For more information, call the Maine Music Society at 782-1403, or log on to www.mainemusicsociety.org.