Trinitas, Little Rock’s only professional choir, will host its fall concert at the Cathedral of St. Andrew Friday, Sept. 20 at 7:30 p.m. Directed by Colin MacKnight, the Trinitas Ensemble comprises 16 singers singing a cappella masterpieces ranging from the Renaissance to the present. Admission is $15 a person or free for children 17 and younger. For tickets, visit tinyurl.com/y5jstn8j.