Alternative vs. Punk vs. Rock vs. HardRock vs. Metal

The list bands that fall under the following genres

 Hard Rock
(Hard and heavy riffs)
*Foo Fighters
* Nickelback
* Three Days Grace
* Breaking Benjamin
* Ac/Dc
* Guns N' Roses
* Led Zeppelin

Metal
(Fast and heavy guitar riffs, long solos, heavy vocals)
* Nirvana
* Iron Maiden
* Metallica                                                                                    
* Bullet for my valentine
* Slayer

Punk Rock
(Fast paced rock, often aimed at rebelling against society)
* Green Day
* Sum41
* Dead Kennedys
* The Clash
* Sex Pistols

Alternative
(As the name suggests, it is an alternative way to play rock, usually a softer way of rock or includes other elements of music) Alternative rock has a huge list some of the popualar ones:
* Linkin Park
* Evanescence
* Coldplay
* Tokio Hotel
* Fallout boy


Rock
(The universal genre which all of the above genres fall into)