William Prevett (born 1984 or 1983 in Vancouver, British Columbia, Canada) known online by the alias Goukisan, is an artist and full time programmer who had primarily created and uploaded music to his Newgrounds page from 2004 until 2008. His rise in popularity can be credited to the Flash rhythm game saga SC Guitar Maniac Dx and later on in the mid-late 2010s with Geometry Dash.
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