In 1963, Leonard Bernstein asked then-16-year-old pianist André Watts to fill in for the great Glenn Gould, who canceled an appearance with the New York Philharmonic at the last minute. Fifty years later, the Grammy winner channels Rachmaninoff as he helps the Santa Barbara Symphony launch its 60th Anniversary season. (Granada Theatre,10/20 @ 8pm; 10/21 @ 3pm; NOTE — Saturday’s show will be broadcast live on KDB 93.7 FM)