Almost all great musicians share one thing in common: they have mastered the fundamentals. Regardless of your instrument or genre, there are certain fundamental concepts and skills which you must master in order to become an accomplished performer or creator of music. All of the games on Theta Music Trainer are designed to exercise a particular area that is fundamental to playing music by ear. However, there may be gaps in your knowledge regarding certain areas. In this section, we will provide a brief introduction and review of the fundamental concepts, and explain why each one is key to the development of a great musical ear and mind.