I would not say it is dead, by any stretch. But I would say some of its best days are behind it. I mean, personally, Pink Floyd is my all time favorite band, and nothing else can really stack up to them. And I think that the spirit of driving guitar riffs and complicated drum beats has moved more into the metal genre, where as the lyrical creativity and melodic originallity of bands such as Zepplin and Pink Floyd has migrated into the indie/alternative genres. Thats just my opinion. Rock itself is not what it used to be, by any stretch of the imagination, but it is far from dead. And really, it depends on each person's definition of rock. If you're willing to cross far enough over genre lines, you can find beautiful rock music on the borders of the above mentioned genres.