Situated in the heart of Chicago's metropolitan area, it is also one of the biggest music venues in America, boasting a capacity of 28,000. The Credit Union 1 Amphitheatre, originally known as World Music Theatre and formerly Hollywood Casino Amphitheatre is one of Americas premier amphitheatres. This site links to resale tickets to events at Credit Union 1 Amphitheatre and is not the box office or venue. This site is not affiliated or sponsored by Live Nation, Ticketmaster or Credit Union 1 Amphitheatre.