Musical with all-a-cappella accompaniment

When you first hear the remarkable singing in “Brick: An A Cappella Musical,” you scan the lineup of singers to find out where all those sounds are coming from.

In place of a band, vocal arrangers Adam Hogston and Joe Mokrycki create instrumental sounds with voices: percussion, bass, melody line, rhythmic movement and harmonies — a choral accompaniment to solos and duets. The sound is amazing, from the opening number of “Effington” through the finale, “Evaporated.” Kudos to music directors Laureen Pickle and Kevin Smith, who make those arrangements literally sing.