Festival highlights include the Colorado premiere of "Songs from a Forgotten World" and the world premiere of "The Ghosts of Alhambra," along with several other performances, a panel discussion, composition seminar and more. Admission to the festival is free. If you enjoy what you hear, the famed Kronos Quartet will perform "Black Angels," a Crumb work for amplified string quartet, on October 2. For more information, visit cu-pendulum.com or get in-dpeth with Crumb's work at his own website, georgecrumb.net.