The Cardiotonics performed for patients at Brigham & Women’s Hospital on Christmas. Among those sharing the cheer was Watertown’s Dr. Thomas Michel, who played his accordion. Patients at Brigham and Women’s Hospital received some Christmas cheer this year when a group of carolers paid them a visit, including a doctor from Watertown. Thomas Michel is a familiar face, and voice, to visitors of the Watertown Free Public Library in warmer months. He often gathers fellow musicians on his porch (which overlooks the parking lot) on weekends for a good song.