CHICAGO (AP) — The Chicago Symphony Orchestra Association says a performance set for Saturday night has been canceled because orchestra musicians have gone on strike.

The organization said in a release Saturday that the 8 p.m. concert at Symphony Center was called off. The association said the previous collective bargaining agreement expired at midnight Sept. 16.

Musicians and management had previously agreed to start the 2012-2013 season this week while contract negotiations continued. The negotiations began this summer.

Rehearsals and concerts were held earlier this week as scheduled.

But the organization said musicians left the negotiating table during a meeting Saturday and "proceeded to strike."

Ticketholders can exchange their tickets for Saturday night's performance for a future concert, donate their tickets or request a refund.