shakuhachi - masayuki koga/ Some people are talking about circular breathing. Koga's breathing for shakuhachi is"Open system" method. For Koga, circular breathing is only "side effect" from the process(practice) of it, not the goal. You can see how he does, visit: http://www.youtube.com/watch?v=FJUUxTQRi_8&feature=related You can do circular breathing with Closed-System, then the sound becomes rather mechanical, not so much musical. 尺八の循環奏法は目的ではなくて、"オープン方式"の呼吸をすれば　その付随スキルとして自然にできるものです。参考までに：http://www.youtube.com/watch?v=FJUUxTQRi_8&feature=related を見てください。