Two young musicians are using their talents to make a difference. Maggie Schneider, 13, and her brother Matthew, 11, both play the violin. They hold a benefit concert every year to raise money for a local organization. This weekend, they'll hold their first one since the start of the pandemic. Matthew, who attends Gilman School, and Maggie, who attends Bryn Mawr School, have accomplished much at a young age: They've played on big-time stages at Carnegie Hall. They even take pre-college courses at the Manhattan School of Music and train under some of the best in the world.