EZO or E・Z・O (earlier known as Flatbacker; Flatbacker style is heavier, faster and less melodic than EZO's) is a legendary Japanese hard'n'heavy band that played something between hard rock, heavy/speed metal and hair/glam rock. Members: Masaki Yamada (v), Hirotsugu Homma (d), Shoyo Iida (g) and Taro Takahashi (b). Masaki and Hiro have played in Loudness some time ago. Hiro is now member of heavy metal band called Anthem. Gene Simmons of the band KISS was instrumental in bringing this band to notice in the USA and beyond.

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