Glenn Gould plays Bach's Partita No. 2.
The Sydney Symphony and Sydney Choirs Orchestra perform "O You Terror," a version of "O Fortuna" with lyrics by Matthew Hodge.
Itzhak Perlman plays bluegrass with John Denver in 1981.
The Denver Brass, with help from Celtic Colorado, performs a musical flash mob at the Cherry Creek Arts Festival on July 6, 2014.