Yamagata Tweakster is an electronic dancing performance musician with laptop. 'Hahn Vad'(he is human and korean, not japanese) and 'GarageBand installed Macbook Air' consists of Yamagata Tweakster. And this one is so impressive for his energetic dancing performance. 'Hahn vad' is also known as 'amature amplifier'. Yamagata Tweakster released 1st EP , summer of 2008. Through 2009 and 2010, released many EPs(with limited quantity). Now, preparing debut album