In the electronic music world, Harsh is Harsh Electro. It is not necessarily dance music, but the topic is usually real, not phony sentiments, unlike many Punk and Industrial lyrics of recent and late past. Many of the distorted-driven songs are far away from mindless Techno, Rave, whatever. It is definitely more sinister than EBM (Electronic Body Music) without trying too hard. Some people think it angry, but true Harsh artists consider their creations as cathartic, the correct meaning of the word.
A compilation called "Electro Radiovengence" is the best Harsh CD I could quickly think of.