Psychedelic trance or psytrance is a form of electronic music characterized by hypnotic arrangements of synthetic rhythms and mesmerizing melodies created by high tempo riffs. It first broke out into the mainstream in 1995 as the UK music press began to report on the exploding trend of Goa trance. Since then the genre has diversified immensely and now offers considerable variety in terms of mood, tempo, and style. Some examples include melodic, full on, dark, progressive, suomi, psybreaks and psybient. Read more on Last.fm.