Amon Amarth are ****ing great, they've risen to my top 3 most listened bands in just a few months.
And Nestor, Led Zeppelin is overrated. They had some good songs, but they certainly didn't rock as hard as people would like you to believe. Clutch isn't similar to them at all, except some of their bluesy stuff maybe.
Here, some more Clutch. Just good, sincere rock 'n roll.