This book takes a look at a very useful subject which is to do with the basic foundation chords that are based around major scales. For now we will only deal with major scales. Minor scales are much more complex and before we tackle that tricky topic we need to grasp the concept using only major scales.
 
The 2-5-1 chord progression is also introduced in this book which is one of the most commonly heard chord progressions in all forms of music but especially Jazz.