BERLIN — Samuel Mariño is a rarity in opera: a true male soprano. Rather than relying on falsetto as a countertenor would, Mariño, 28, is able to comfortably sing high notes with his chest voice.

Concord Singers, a non-auditioned treble community chorus, invites all sopranos and altos to its Open Sing and Reception at 7 ...

The student choirs, comprising sopranos, altos, tenors, and basses, will number between 25 and 35 singers each. Each student group will sing two of its own selections.