As a solo concert pianist, Sara Faust had as one of her first pianos a Steinway & Sons from the 1970s—a notoriously poor era for Steinway. “I just want a great, old piano, if I could find it,” she would say to her husband, Irving. She didn’t know what that meant at the time, just that she’d had teachers with Steinways that sounded worlds apart from hers. “I started this business to search for the perfect piano for myself,” said Sara. She and her husband are co-founders of Faust Harrison Pianos, one of the nation’s largest carriers of quality pianos. Today the operation boasts a 12,000-square-foot piano rebuilding facility and five showrooms, in Manhattan; White Plains, New York; Melville, New York; Fairfield, Connecticut; and Paramus, New Jersey. The company carries everything from digital and starter uprights to high-end concert Bosendorfer and Fazioli grands, and, of course, the rebuilt heirloom Steinways …