The extremely important core of music or even of our life is; expansion for freedom. Freedom to play music without chain or any restriction. In order to be free we need to open our mind and body. However it is easy to say but, it is difficult to do. Then how to open up our whole body depends on how steadly and concretely start and keep going forward to reach our goal step by step. That is about this book from my 50 years experience. We start from basic breathing, simple posture and gradually we check each part of the body some are visible (we say outer-muscles), some are difficult to see or touch (inner muscles) including organs like throat, inside mouth, diaphragm, and back-muscles. In order to check our whole body since we have around six hundred muscles (it is plenty), so we need to do gradually herefore, you could open and read this book wherever you feel comfortable (you don't have to start reading from first page; just open the book and enjoy that page. And when you feel start reading from the first page, then that is the time to organize your idea of managing the whole body. But don't force yourself because it is good to maintain the free-attitude for anything. English and Japanese, Shakuhachi (Japanese bamboo flute) master, Masayuki Koga, wrote this "Atlas of Insight of Music" from his 50+ years of experience; performing, teaching, lecturing and providing workshops at Stanford University, NY University, UC Berkeley and Japanese Music Institute of America. Grammy Award nominated for his opening recording of CD 2007. Also, joined recording at Skywalker Studio for a movie of "The Sea of Trees" 2015. The copy of this text is stored at the Library of Music department in Stanford and, UC Berkeley as well.