Begun in 1976, this series is the single biggest annual arts event in Boulder, with visiting musicians from around the world performing in the acoustically revered Chautauqua Auditorium. The festival presents works by composers of the classical through modern eras, such as Bach, Beethoven, Mozart, Dvorak, and Gershwin, plus living composers. It usually runs from mid-June to mid-August, with symphony orchestra performances Thursday and Friday, chamber-orchestra concerts Sunday, and a chamber-music series Tuesday; all shows start at 7:30pm. There’s also a children’s concert in late June and a free Independence Day concert at CU’s Folsom Field. Adult ticket prices range from $12 to $49.