The CSO Gospel Choir has a new branch of singers, the CSO Spiritual Ensemble. And its upcoming show is sold out. The group of 35 singers will focus vocally on the traditional African-American spirituals for their annual Palm Sunday concert. The concert, Spiritual Classics, will take place on April 5 at 5 p.m. at the Citadel Square Baptist Church. Tickets are $10 and may be purchased at the Gaillard Auditorium Box Office or an hour before the concert at the church. —Emma Hart