books.google.co.uk - The Rockmaster System is a rock style keyboard learning method. It is based on a patented music formula and it can be used to play any non-classical music style. It is a visual system and does not require learning to read music. Practice chord changes even without a keyboard....http://books.google.co.uk/books/about/The_Rockmaster_System.html?id=l0Vx5VB96FQC&utm_source=gb-gplus-shareThe Rockmaster System
