There is a course called "songwriting" that you can find at the www.coursera.org platform. you can sign in for free and then follow all the courses you want, this one is excellent. You can choose to pay for the certificate or just do the course for free without certificate. This course in particular allows you to see the content but not to do the exams if you haven't payed... but you can apply for financial aid and then do the entire course for free! that is what I did, it helped me a lot and I recommend you, I think you will like it :) (I also think I gonna do a post about that, can be helpful for a lot of people)

I also love rock and roll! which artists do you like the most? :D