Mono was founded in January 2000 by guitarist Takaakira Goto. Working by himself, Goto completed most of Mono's demo tracks, partly influenced by guitarist Loren Connors. By late 1999 Goto began the search for band members; the first to join was fellow guitarist and long time friend Yoda. Soon afterwards the two guitarists linked up with bassist Tamaki and drummer Yasunori Takada. The group soon released a 4 track EP entitled Hey, You on the small independent label Forty-4.