Rock Music?

Apparently there are some people whom have no idea what "rock music" really is. Kenny G (a name I would never put in in the same sentence with either the words "rock" or "music") has, according to AOL music, has done a "rock song" Weezer (another name I would never put in in the same sentence with either the words "rock" or "music"). Does no one know what "rock music" is anymore, or for that matter, what "music" is anymore?