Chicago Sound Collective (Formerly Altered Stage) We are a Chicago music club that helps you discover your inner musician and play live at regular performances at local venues. We’ve built a fully equipped rehearsal space in the West Loop and have a supportive membership that has walked your exact path. Members have access to instructors who can teach a variety of instruments – from beginners to advanced. Our Membership collaborates to pick and practice songs to play at live gigs in Chicago venues regularly throughout the year.