Complete Adult Keyboard Course contains 4 books. 1 Keyboard Course is the core book of an exciting method that combines all styles of music with sound educational philosophy. 2 Keyboard Theory corralates exactly with the course book. 3 Keyboard Cla ssical is an excellent collection of everyone's favourite classical themes correlating exactly to the method page by page. 4 Keyboard Pop Book is also correlated to the method page by page.