Miriam Fried and Jonathan Biss come to chamber music with a deeper sensitivity to each other’s quirks than most duos. Mother and son, they maintain busy solo schedules that leave few occasions for these public family reunions. This unconventional program of Mozart, Janáček, and Debussy violin sonatas is their first in Philadelphia since 2013. Tickets for the live event (postponed from November) are long gone, but there’s a waiting list, and a real-time live stream that remains available for 72 hours. —M.G.