Trance

Trance emerged as a form of electronic dance music around 1990, with the advent of music that was essentially techno or house, but had simplified drums, extreme repetition, and other hypnotic effects such as sustained chords and long echoes. Trance generally has no "thump" in its percussion or "groove" in its basslines - that is, the hi-hat and bass in the kick drum are generally de-emphasized compared to house or techno, and basslines tend to consist of flat notes, without modulation, limited to a small range of notes. Trance tempos are generally slightly faster than techno, but can vary considerably. Trance Production part of the Trance article on Wikipedia.