Mad Virtuosity: The Week’s 8 Best Classical Music Moments on YouTube. Classical Music, National Anthems, Opera, Boston Symphony Orchestra, Metropolitan Opera, YouTube.com, Bernstein, Leonard, DiDonato, Joyce, Dudamel, Gustavo, Nelsons, Andris, van Zweden, Jaap, Norma (Opera), Maria Stuarda (Opera), The Star-Spangled Banner (Song), West Side Story (Movie)