Music Theory textbook on iPad

I've upgraded to Lion, dowloaded iBooks Author and have begun working on a Music Theory textbook.  iBooks Author seems very easy to use and I am sure newer versions will be even slicker.

I hope to get a template done this school year and finish over the summer.  At least that's the plan.  I currently don't use a textbook in my music theory class, so in theory the book is already written.  Right?