The upcoming world premiere at the Dallas Symphony Orchestra of a classical music piece inspired by the late Supreme Court Justice Ruth Bader Ginsburg would probably have been impossible if not for a bunch of lawyers in the Chicago area, a Long Island fine arts foundation and an award-winning pianist and composer who put the deal together.Such is the art of financing new musical works in the midst of a pandemic.Even in the best of economic times, finding funders for new orchestral works is typically difficult.“You’re …