It is a subgenre of Hard Dance Music. The average time is between 140 and 160 bpm (beats per minute), however, hardstyle DJ's are known to use their own time beat.
In 1992 the style started becoming popular in several countries in the world, including: Belgium, Poland, Estonia, Denmark, Australia, South Africa and United Kingdom. However In the Netherlands, United States, Spain and Germany trance is more popular. A large hardstyle movement started in Spain anno 2007. Among others Madrid Hardstyle Movement and Jewel of The Crown represent the Spanish artists. Hardstyle started out as Hardhouse (fast hardhouse from United Kingdom) and was mixed with Oldstyle as a combination. This went on to create the sound we hear today. Examples are builder- hardbeatmarket.
Source: Wikipedia > Hardstyle
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