For six centuries, the Vienna Boys Choir has captivated audiences with a purity of tone, charm, and a crowd-pleasing repertoire. “Christmas in Vienna” showcases these child musicians in a show featuring Austrian folks songs, classical masterpieces, and holiday favorites. Carnegie Hall, Stern Auditorium / Perelman Stage, 881 Seventh Ave. at 57th St. Dec. 13, 2 p.m. Tickets are $10-$90 at carnegiehall.org.