Psychedelic trance, psytrance or just psy (derived from the use of psychedelic drugs) is a genre of electronic dance music characterized by arrangements of synthetic rhythms and layered melodies created by high tempo riffs. By 1998 psytrance had become a mainstream form of music. Psytrance lies at the hardcore, underground end of the diverse trance spectrum.The genre offers variety in terms of mood, tempo, and style. Some examples include full on, darkpsy, Hi-Tech, progressive, suomi, psy-chill, psycore, psybient, psybreaks, or “adapted” tracks from other music genres. Goa trance preceded psytrance, when digital media became more commonly used psytrance evolved. Goa continues to develop alongside the other genres.