OhMyRockness, perhaps the greatest comprehensive resource for live show info ever, wants to make sure you're well-aware that if you want to enjoy music in Chicago, you can—for free! They've created a masterlist of all free rock shows happening in the city from May until the snow falls. Summer in Chicago is a happy time, a time when people scamper about in good moods and give away things without expecting, you know, money in return. We've got our hearts set on more than one free show at Millennium Park this summer, starting with Iron and Wine on June 6. And your faves are?