I Love to Hate to Practice companion to Mother Tongue Learning by Zane Hrynewich
"Improvisation should be at the core of the music curriculum. It should come first and should remain at the core of music education throughout the later years of increasing expertise. Musicians educated with improvisation at the center will have a better-developed ability to think musically – to deeply understand music as well as be better prepared to interpret written scores."..... R. Keith Sawyer