You want confusing?
"Hardstyle, sometimes referred to as hardbass, is a sub-genre of trance music that is closely related to nu style gabber and hard trance.Its a fusion of both Hard Trance and Hardcore. Hardstyle is grouped in the Hard Dance section. Its sound is usually characterized by a four to the floor kick beat and an off-beat gabber style bass line, trance like synth stabs and sweeps and miscellaneous samples. Tracks often feature excessive reverb and/or other effects, breakdowns and occasionally small breakbeat sections. The average tempo is between 140 and 150 bpm, around 30 slower than nu style gabber. Many hardcore artists produce hardstyle songs, which sound very similar but are more accessible. Hardstyle is generally played alongside Nu-NRG and gabber in the UK and aside hard trance or hardcore in the rest of Europe."
Listen at www dot hard dot fm (Though i've not listened to this site before).
US Dancing... http://www.youtube.com/watch?v=UZAfSD1Misw
Europe Jump dancing... http://www.youtube.com/watch?v=qqBcXWtoqAU
Metallica remix... http://www.youtube.com/watch?v=ZXJA0ZLkcgY (of course its in holland, all hard music is - whopee)
If you don't know diff dance music types, then you'll think it's just noise.