Quantum Collective has announced the lineup for two massive free shows at Whole Foods Rooftop on Fri. Mar 20 and Sat. Mar. 21 from 11 a.m. to 10 p.m. "Dangerous" Brooklyn electropop duo Big Data, Brit rockers the Zombies, bearded Canadian rockers the Sheepdogs and Ithaca alt-rockers X Ambassadors headline. RSVP here.