[Adjective] Strongly following a particular belief or activity. Also openly showing sexual activity. Example: He belonged to a hardcore group of football hooligans.
Found on http://www.bbc.co.uk/skillswise/glossary/
In pop music, of any style, the more extreme and generally less commercial end of the spectrum: hardcore techno is a minimalist electronic dance music; hardcore rap is aggressive or offensive; hardcore punk jettisons form and melody for speed and noise. There are several main tendencies within hardcore punk. The very similar styles know... Found on http://www.talktalk.co.uk/reference/encyclopaedia/hutchinson/m0031566.html
[electronic dance music genre] Hardcore is a sub-genre of electronic dance music originally European from the emergent raves in the 1990s initially designed at Rotterdam in Netherlands, derived from techno. Its sub-genres are usually distinct from the other electronic dance musics by a higher rapidity (160 to 200 BPM or more), the intensity... Found on http://en.wikipedia.org/wiki/Hardcore_(electronic_dance_music_genre)