The Jay Pritzker Pavilion was designed by star architect Frank Gehry and built in 2004 to replace the existing structure for outdoor concerts in Millenium Park in Chicago.
Even when there is not a concert, the pavilion is illuminated at night in bright colors which change every few minutes.
It can accommodate 11000 people in total. There is seating for 4000 and another 7000 people can sit or stand in the grassy area extending directly from the stage.
The overarching metal elements contain the speakers and the LARES audio system. Acoustical engineers designed this system particularly for the high degree of quality required for classical music.
The LARES technology emits waves that emulate surfaces, which creates a sort of invisible shield surrounding the tubular structure and gets the sound waves that travel through inside to behave as if they were spreading in a closed auditorium.
In photo #3 my tripod is positioned approximately 180 meters from the stage at the "back" of the grassy area where concertgoers sit or stand.
Concert season hadn't started yet and it was quite cold (near freezing) as I took these pictures in early May.