Whether you’re in Grant Park (like us) or on your couch, here are 10 artists worth building your weekend around. Sienna SpiroShe is 20 years old, London-born and already doing things that make the “ones to watch” designation feel like an understatement. Her sound pulls from soul and ’60s pop, and her voice is the kind that makes a large outdoor stage feel immediately smaller. If That Makes Sense, their third album produced by Mike Crossey (Arctic Monkeys, Wolf Alice, The 1975), debuted at No. Spacey Jane write enormous songs, the kind built for singing back at a band, and Lollapalooza is a natural stage for them.