Book is lovely, has this warmth which everyone needs so much. Probably you heard the story, but I assure you - you won't be crying all the time. It is written nice and easy to read! Go and get your book! (if you are too lazy, here is the link ;)
What about the movie? When you read the book I really recommend to watch also the movie. You won't be disappointed. Usually book is much better than the movie, but in this case I would say that the director did a good job :) Here is the trailer:
And then finally the SONG! I heard it before I saw the movie and I have to tell you - I love it. It is so nice and positive, despite the circumstances. Enjoy!