Miley Cyrus – 7 Things – Official Music Video (HQ)

How can I learn about music theory?
I am a 17 year old high school student who is planning on majoring in music in college. I understand I will have to take a LOT of music theory classes. However, I do not have a music theory class available at my high school. Does anyone know a workbook or something so that I can try to teach myself (with help from my band and choir directors) about music theory?

Thank you for your help!

7 Things featured on her brand new album Breakout available in stores and on iTunes July 22, 2008. Get it now at www.mileycyrus.com