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1.
A type of music with high BPM and happy vocals and/or sounds. Mixed by DJs at Raves. UNDERGROUND!
Heart of Gold
Eternity
Break of Dawn
by Brandon December 10, 2003
 
2.
A type of electronic music that has high BPM
Do you listen to happycore?
by Cheeks August 18, 2003
 
3.
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
by Bronka February 29, 2004