There are metal bands that are very heavy and have alot of aggression, but the same thing goes with modern rock bands such as Three Days Grace and Breaking Benjamin. Meet Mr. Buzzer, Buzzes, this thing will help you decide if it is rock or metal.

Avenged Sevenfold, Buzzes, I don't think so. These guys are Metalcore but they are changing into modern rock so the are worthy of the rock section.

Led Zepplin, Buzzes, nope, I hate this band anyways. This band has more of a blues roots so if anything it would go into classic or blues rock.

Disturbed, yes, these are heavy guys. They are nu metal but what does that matter.

Evanescence, Buzzes, no. I will consider them to be metal but really, they sound more rock sounding than anything. They are like a haunted sounding rock especially with the Fallen album.

Linkin Park, Buzzes, heck no. These guys are nu metal and rap rock. Though latley they are more like hard rap rock so theres that.

Black Veil Brides, Pierce The Veil, Fall Out Boy, and Attack Attack, Buzzes, nope. They are all emo bands and rightfully so, these are all also very poppy sounding. It only makes sense.

How about The Offspring, Buzzes, no they are in metal somehow. The are punky so I guess that makes sense but it needs to be in rock or pop punk.

How about Rise Against, Breaking Benjamin, or Three Days Grace, Buzzes, HECK NO! These are all modern rock bands and are supposed to sound heavy as thrash metal. I love these bands though.

Now how about Tool, yes, Dream Theater, yes, Opeth, yes, Rush, Buzzes, Queensyrche, Buzzes, at least for me anyways, how about Coheed and Cambria, Buzzes, they are progressive rock much like Queensyrche. These guys are only heavy as heck because they started inthe modern area.

Nine Inch Nails, Buzzes, there is such a thing as Industrial Rock people.

Papa Roach, Buzzes, these guys sound nothing like a metal band believe me. There music is amazing but really, WHY DO PEOPLE KEEP SAYING THIS IS NU METAL?!!!!!!

Well thats all for now but don't worry there are plenty of other bands to talk about genre.