I used to listen to only classical music, especially piano music. Now, I listen to all kinds of music from pop, rap, R&B, latin, and most recently, classical tango. I think my varied interest is mainly because I understand music much better than I once did.
Listening to Western classical is like only being able to speak/write in English. But listening to a variety of music, and understanding them, is like being able to speak a dozen different languages and understanding the meaning behind the sounds.