Okay, Number 1, you're putting Rock and Metal in the same category. That's bad. That's like saying Final Fantasy VII and Oblivion are the same because you wander around an open world killing stuff.
Rock: Can't go wrong with The Who or The Rolling Stones
Hard Rock: Guns & Roses, AC/DC, or my personal pick for the category, Sonata Arctica
Metal: 4 Pillars of the Metal Temple: Sabbath, Maiden, Priest, Metallica
Heavy Metal: Cradle of Filth or Nine Inch Nails would work fine.
Symphonic Metal: Nightwish, Within Temptation
Grunge Rock: Nirvana, Pearl Jam
Acid Metal: There is only one answer: Butthole Surfers.