Concord Chamber Singers (CCS), an elite 40-voice chorus that has been making music and contributing to the artistic richness in the Lehigh Valley for 50 years, will offer a free concert on April 22, 2017. According to Artistic Director Jennifer Kelly, the concert, which includes the world premiere of Hilary Tann’s “Measuring the Distance” as well as Sunrise Mass by Ola Gjeilo with chamber orchestra, is an opportunity for the chorus to thank the community for decades of faithful support. The celebration will take place at 7:30 p.m. at Wesley Church, 2540 Center Street in Bethlehem, and will be followed by a reception. A pre-concert lecture with Kelly, founding director Blaine Shover, and composer Hilary Tann will take place from 6:30-7 p.m.