Definitions by Bronka

happycore 

A type of techno with a happy atmosphere and lots of female vocals. The music is very fast: 160-180bpm

It is also called Happy Hardcore and
4-beat

Cherrish
Highlander
CIXX
Critical mass

An example of a known song in happy hardcore:

Nakatomi - Children of the night

happycore by Bronka February 29, 2004