The 7 Theory is a small book that will make a big change in the life of any musician. Whether youve been playing for decades or only a few days, The 7 Theory will catapult your ability. Dont take my word for it. Take the word of hundreds of readers and students whove learned The 7 Theory. If youve always wanted to understand music theory, this book is for you. If youve always wanted to understand how to play by ear so youre not stuck staring at charts, this book is for you.