James C. Petrillo Music Shell

The Petrillo Music Shell is an outdoor amphitheater in Grant Park in the Loop community area of Chicago in Cook County, Illinois, United States. It serves as host to many large annual music festivals in the city such as Chicago Blues Festival, Chicago Jazz Festival, Taste of Chicago and Lollapalooza.

It is also the former host of several smaller annual events that have moved to the newer Jay Pritzker Pavilion such as the Grant Park Music Festival, Chicago Gospel Music Festival, and Chicago Latin Music Festival.

Source: Wikipedia