We've done it before and we will do it again (via Chicagoist):
Get cultured, sip cocktails and listen to jazz underneath the evening sky at one of two Chicago museum terraces every week this the summer. The choice is yours, Tuesdays at the Museum of Contemporary Art, or Wednesdays at the Shedd Aquarium. Both have announced their outdoor summer jazz series beginning next month.
Jazzin’ at the Shedd invites sealife lovers and jazz aficionados alike to relax on their lakeside terrace on Wednesdays this summer. They haven’t released their lineup yet, but the season will run from June 26 through September 4. Tickets will be $18 for adults, $16 for kids as part of an all-access pass to the museum including the original galleries, Wild Reef and Abbott Oceanarium exhibits. Upgrades are available to experience the popular Stingray Touch and Jellies exhibits. 1200 S. Lake Shore Drive.