Trance is a genre of electronic dance music that developed in the 1990s. It is generally characterized by a tempo of between 125 and 150 bpm, repeating melodicsynthesizerphrases, and a musical form that builds up and breaks down throughout a track. It is a combination of many forms of sound such as techno,house, industrial, new age, pop, chill-out,ambient, electronic art music, classical music, and film music. It is usually more melodic than techno, and the harder styles usually have harder beats than house. The origin of the term is uncertain, with some suggesting that the term is derived from the Klaus Schulze album Trancefer (1981) or the early trance act Dance 2 Trance. Others, though, argue the name may refer to an induced emotional feeling, high, euphoria, chills, or uplifting rush listeners claim to experience. Yet others trace the name to the actual trance-like states that the earliest forms of the music attempted to generate in the 1990s before the genre's focus changed.