Composer Terry Riley (center) celebrates his 50th birthday in 1985 with his muses in the Kronos Quartet (from left) David Harrington, John Sherba, Hank Dutt and Joan Jeanrenaud. Richard McCaffrey/Courtesy of Kronos Quartet hide caption

itoggle caption Richard McCaffrey/Courtesy of Kronos Quartet

An incredible roster of musicians gathered at Carnegie Hall in 2009 to play Terry Riley's epic 'In C' — with the complete, but only single-page, score projected overhead. Julien Jourdes/courtesy of Carnegie Hall Archive hide caption

itoggle caption Julien Jourdes/courtesy of Carnegie Hall Archive

The Nashville Symphony with Music Director Giancarlo Guerrero (center) during Spring For Music at Carnegie Hall in Manhattan, New York on May 12, 2012. Melanie Burford/NPR hide caption

itoggle caption Melanie Burford/NPR

Cellist Pablo Casals, violinist Fritz Kreisler, pianist Harold Bauer and conductor Walter Damrosch in 1904. Blaine Littell Collection of Walter Damrosch Memorabilia / Carnegie Hall Archives hide caption

itoggle caption Blaine Littell Collection of Walter Damrosch Memorabilia / Carnegie Hall Archives