List of bands (22):

Nestor
Nevertel
Newsted
Nickelback
Nightwish
Nikt
Nirvana
Nita Strauss
Nocny Kochanek
Nocturna
Novelists
Novembre
Nuclear Messiah
Nuclear Warfare
Obituary
Obscura
Ocean Grove
Omerta
Omnium Gatherum
On Thorns I Lay