New Hampshire-born singer-songwriter Andrew St. Aubin, formerly of the indie-pop band Aldenbarton, is now embarking on a new project called Son of the Granite State. A talented multi-instrumentalist, here he demonstrates his masterful piano chops and ability to croon out a contemplative ditty, his own playing accompanied by a player piano he programmed himself — one of many in a room of baby grands at the Yamaha Piano Salon in midtown Manhattan.