It's hard to say all bands that I like, but let me try!
Iron Maiden, Children of Bodom, Sinergy, Judas Priest, Black Sabbath, Helloween, Gamma Ray, Joe Satriani, Steve Vai, Pantera, Venom, Kalmah, AC/DC, Eric Clapton, Edguy, Ozzy Osbourne, Bruce Dickinson, Nightwish, Eternal Tears of Sorrow, In Flames, Dark Tranquility, Accept, Apocalyptica, Avantasia (it's a project, but is very very good), Cradle of Filth, Creedence, Deep Purple, Demon, Dimmu Borgir, Iced Earth, Rainbow, The Beatles, Slayer, The Doors, Pink Floyd, Warmen.. hmmm.. and many others