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.Ĭredit Union 1 Amphitheatre, originally known as World Music Theatre) is an outdoor music venue located in Tinley Park, Illinois. Originally known as World Music Theatre and formerly New World Music Theatre and Tweeter Center, is one of Americas premier amphitheatres. The Credit Union 1 Amphitheatre, previously Hollywood Casino Amphitheatree.