The Princeton Symphony Orchestra’s digital series, “Buskaid — A Musical Miracle,” which showcases South Africa’s Buskaid Soweto String Ensemble, presents guest harpist Jude Harpstar and violinist Mzwandile Twala in “Curious Creatures and a Heavenly Harp,” available Friday-Sunday, April 30-May 1. Works by Carlo Farina, Claude Debussy, Felix Mendelssohn, and Fritz Kreisler are on the program. Access is $5. Visit princetonsymphony.org.