Indeed thats what i voted for, but although rock and metal are both dominated by guitars and metal is sort of sub-genre of rock, from a guitarists point of view there is a lot of difference say between Jimi Hendrix and Kerry King (Slayer) thats why i would have thought it would be best to split the two. I mean theres no way that the guitarist from someone like Ash and Papa Roach would keep up with the pace of somone like Paul Gilbert and this is what gives the genre a very different feel.