Hard Base Music

I put here some link 's to a hard base music:
http://www.youtube.com/watch?v=nFwP3Yc-w6s&feature=related
http://www.youtube.com/watch?v=0iKuEOPR69I&feature=related
http://www.youtube.com/watch?v=eVEOx0gdkuA&feature=related
http://www.youtube.com/watch?v=_Cl41h5rD40&feature=related