What is Piano Junior? Piano Junior is a superb piano course for beginners. It's creative, it's interactive, it's colourful, it has its own website with additional online material – and most importantly, it really works! Its characters, PJ the friendly robot and his sidekick Mozart the dog, motivate and encourage children throughout each level. The course is available as core Lesson Books, along with supplementary Theory, Duet and Performance Books at each stage.