Disambiguation; There are 7 Groups with the same name. 1) A death metal band from Poland started in 2004; 2) A rave/happy hardcore group from The Netherlands, popular in the Mid-Nineties.
Critical Mass was formed in 1994 by Ed Bout and Dave Hasselaar. ID&T records (the centre of hardcore at that time) wanted a live act. At the beginning both producers where the act by themselves but not much later they integrated the singer Ludmilla Odijk and rapper Danny Haenraets alias MC Energy.