The 10-day intensive orchestral and chamber music program, which cellist Yo-Yo Ma called “the defining moment for me as a teenager,” culminated in two sold-out concerts at Carnegie Hall, December 24 and 28, hailed by The New York Times for … Jacobs School students participating in the seminar included violinist Stanislav Pronin, 22, of Toronto; violists Leah Kovach, 21, of Salt Lake City; Dash Nesbitt, 20, of Jenks, Okla.; and Nathan Schram, 20, of Arlington , Texas ; …