Songs to listen to while writing?

Well i have recently started listening to clical music wile i'm writing and was surprised by how creative the song made me. All i listened to was Beethoven's Moonlight Sonata and it made me cry while writing. I did my best writing listening to that song. Are there any clical songs that you suggest that will have some happy songs evoke a similar feeling. Also give some songs that are happy, because not all of my book is totally depressing.