The Rockmaster System Book 1: Relating Ongoing Chords to the Keyboard

The Rockmaster System, Visual Piano Learning Method is an innovative
piano/keyboard learning method that allows even those with no experience
in reading music or playing piano to start playing within minutes.
The secret to the Rockmaster System is its patented chord changing method
and its simplified piano tablature; these combine to make the Rockmaster
System the simplest method for learning piano available today.
By devoting just half an hour per week to practicing the Rockmaster System,
students will learn to play keyboard accompaniments at a relatively high
level in less time than they thought possible.