7:30 p.m. April 20, St. Joseph Catholic Church, 830 Poplar St. This ensemble of singers is composed of professional singers who teach and perform in St. Petersburg, Russia. The program is made up of Russian Orthodox church music and Russian folk songs. Free. 478-745-1631.  Also performing 7 p.m. April 22, Christ United Methodist Church, 511 Russell Parkway, Warner Robins. Free; donations accepted. 478-922-0211.