Why won't Pandora recognize my account?

I've had a Pandora account for quite a while, and I've never had a single issue with it. However, whenever I type my email and password into the sign in window, it comes up saying it won't recognize my email or password. This is rather annoying seeing that I had the perfect mix of stations and do not want to begin a new account, with a completely different e-mail. Does anyone know what the problem may be and If I can fix it?