Find a broken music box by digging in your field. Once you're good enough friends with Rick, he will repair it for you. Once repaired, you can give it to any of the Bachelorettes, and it will boost your relationship status slightly. You can dig up the Music Box continuously and repeatedly give it to girls. Combining the Music Box and gifts daily, it is a very handy way to raise a girl to a Pink Heart in only one Season.