The heavy industrial branch of electronic
music usually produced by the underground scene (DIY community, new age nomads etc). The
music is fast, normally 170 to 200 bpm and characterised by a pounding repetitive kick drum. The
music is played from large sound system rigs. It evolved from the Rave music in early 90s in the Europe (including the United Kingdom, the Netherlands, Italy, France, Germany, Austria and the Czech Republic.)
Wiki article with good informations:
en.wikipedia.org/wiki/Free_tekno_(music)