I got this for fun at the library and it turned out to be pretty interesting:
http://www.amazon.com/exec/obidos/tg...glance&s=books
It's called The Classical Music Experience: Discover the Music of the World's Greatest Composers by Julius H. Jacobson II and it has 2 cds narrated by Kevin Kline. It just takes you through different composers and has a little bio and description for each composer and piece. It's written by a layman (i.e., not a musician) so it's a very easy read and he describes the music using terms everyone can understand. The CDs contain short samples of the pieces he selects for you to listen to. It's a great way to figure out what and who you like and also make you a little more knowledgable about composers and classical music in general.