18 Rules of Happiness by Karl Moore

Thanks to the Spirited Lady website, Karl Moore's online book, "The 18 Rules of Happiness" is a free gem. Not only are there very short chapters (as in 2-3 pages) of pointers "designed to shift your perspective, helping you to rediscover the happiness you may have forgotten", but there are some bonus chapters as well. Appendix 3 lists "Happy Songs for your Collection" that supports your happy mood making. Appendix 4 lists some "Feel Good Foods".
http://www.spirited-lady-living.com/support-files/18-rules-happiness-sll.pdf