 You will have a very good seat, the one you're in right now, the best seat in the house when you tune in for Carnegie Hall Live, Saturday at 3 p.m. This weekend's concert features music for piano, including works by Mendelssohn, Mozart, and Beethoven, and a rousing encore by pianist Daniil Trifonov. Settle in for Carnegie Hall Live, Saturday, 3 p.m.