Playlist: unstoppable

I'm not big on playlists. But one small collection I have is called “unstoppable”. For those metal tracks that have a certain extra je ne sais quoi. Not the heaviest, not the fastest, not the most evil. But with a pummeling, relentless drive forward. Unstoppable. Not sure if Machinehead’s Blood for blood was first or Iron Tusk by Mastodon. They're both prime examples of unstoppableness :-)