VoXX: Voice of Twenty invites the community to join in a celebration of 15 years of singing together, first as Ave Maris Stella and now as VoXX: Voice of Twenty.

The group will open its summer series Friday, June 19, at Belfast’s First Church UCC, 104 Church St.; and Saturday, June 20, at Union Hall, 2 Central St., in Rockport. Both concerts begin 7:30 p.m. Admission is $10, at the door.

Ave Maris Stella started out around the turn of this century as a group of passionate singers who gathered in living rooms to challenge themselves with early, a cappella music. Since then, it has grown in size, skill and courage, entertaining not only themselves but audiences on the Midcoast and beyond. In this concert series, the singers will share some of the pieces they have sung and loved for many years, along with others that are brand-new to them and one world premiere, composed by member John Mehrmann.

VoXX is collectively run and enjoys the challenges of unusual a cappella vocal music, yet more familiar works by composers such as Byrd, Dufay, Josquin, Monteverdi and Palestrina also form a large part of its wide-ranging repertoire. With a focus on early music, the singers also enjoy performing settings by contemporary composers such as Barber, Britten, Duruflé, Lauridsen, Pärt, Poulenc, Tavener and Whitacre. The summer series includes works by Byrd, Lassus, Bach, Harris, Rachmaninoff and more.

The members of VoXX have performed at many venues around Maine, from Merrill Auditorium and the Irish Heritage Center in Portland to St. Denis Catholic Church in Whitefield and Blue Hill Congregational Church. It always is in search of acoustically pleasing venues in which to sing. Membership in the all-volunteer group is by audition; visit voiceoftwenty.com for more information and an application form.

The group performs two concert sets annually, in mid-January and June/July; and is available at other times by arrangement. The summer series will continue in July with concerts Friday, July 10, at 7:30 p.m. at Rockville Chapel (a benefit for the Rockville Steeple Restoration Fund); and Sunday, July 12, at 2 p.m. at the Old South Cushing Church.

Courier Publications’ A&E Editor Dagney C. Ernest can be reached at (207) 594-4401, ext. 115; or dernest@courierpublicationsllc.com.