Electronica
Electronica is a loosely defined genre that does not fall into the new age, techno or dance categories; it is often referred to as "left-field". Styles of electronica include downtempo, illbient and trip-hop (among countless others, see list of electronic music genres), which are all related in that they usually rely more on their atmospheric qualities than electronic dance music, and make use of slower, more subtle tempos, sometimes excluding rhythm completely.
IDM (an abbreviation for intelligent dance music) is an elusive and confusing genre classification that can only be truly defined by flagbearers and flagburners like Aphex Twin and Autechre.
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