A Good Theory Website

Many, many times I have spoken to people who equate theory expertise with composition. This isn't exactly true, however. I always draw a comparison with fine art painting. You can go learn about color theory, squares, spheres, shading, etc, but this does not make you an artist. Same with music theory. Composers will find theory a bit easier than others, and it is good to have a solid grounding in theory. But don't confuse theory and composition.

Having said that, I came across this website which I like a lot! If you are looking to brush up on your theory, here you go: www.musictheory.net