for me music is probably top of the list...it can lift you when you're down...music can compliment any mood or any emotion and create its own as well...sometimes you can enjoy music hugely without much effort when compared with other art forms
music can also be more of a journey into the unknown...going a buying cd's just because you like the cover and having no idea what to expect...you could be buying the biggest load of crap...but you could just be buying music by a band that you will treasure your whole life
film lacks that kind of mystery...even when buying a dvd of a film you've never heard of...its reasonably easy to guess what its going to be like
books would be a close second to music for me...the fact that very descriptive books require you to use your own imagination to picture the events in your mind is something that makes the experience more personal than film as a medium...a great example being high-rise by JG Ballard...a genius book for stirring the imagination