CHICAGO — Listen closely at the intersection of Belmont, Lincoln, and Ashland in Lake View, and the City of Chicago becomes a symphony with buses, bikes, and babies all part of the ensemble. “You’ve got people walking by, cars and everything,” said Marilyn Estrada. But J.P. Bader is adding an instrument that will let the good times roll – a 600-pound piano. “I built this to be remote...