How to Blitz! Theory Grade 1 contains more information, more revision and more worksheets than any other theory text book. How to Blitz! Theory Grade 1 contains more information, more revision and more worksheets than any other theory text book. One of the best features is the clearest and easiest section on music notation ever written. It assumes you’ve never actually seen music before. If you already know how to read music, you will find this section SUPER EASY!!! Whizz through it and impress all your friends. Although music theory applies to all instruments, not just piano, it is the piano keyboard that is most helpful in demonstrating certain things you need to learn, such as semitones and accidentals. The reason for this is that the piano keyboard is a visual pattern. If you are learning to play an instrument other than piano, you’ll find plenty of piano keyboard diagrams in the book to help you understand some of the concepts more easily.