In 1976, Emmy-winning star of stage and screen Jeff Daniels bought a Guild D-40 from Herb David’s Guitar Studio in Ann Arbor, Michigan, threw it in the back of his old Buick, and moved to New York City. That guitar led to a creative outlet, became a solace, a road into the artist that he didn’t know existed. Now, over 40 years later, he’s still writing songs, singing them, and playing. On Friday, Oct. 17, Daniels comes to Maine and will perform at the historic Opera House in Boothbay Harbor.