The ZZ Top performance scheduled for Aug. 1 at Musikfest has been cancelled due to surgery for one of the band's members.

Bassist Dusty Hill is scheduled to undergo surgery to remove two kidney stones, delaying the start of the group's U.S. summer tour. People who purchased tickets to the ZZ Top Musikfest show will be issued a refund starting July 22. Individuals who purchased tickets with cash will need to present tickets in person at the ArtsQuest Center Box Office, 101 Founders Way.

To contact the ArtsQuest Box Office, call 610-332-3378.