New........

PolarityMan

Opeth:

http://teamrock.com/news/2014-06-02/exclusive-hear-the-first-track-from-the-new-opeth-album

and

Mastodon:

http://www.metalinjection.net/av/heres-the-new-mastodon-song-chimes-at-midnight

The Opeth one is another nod to 70s prog. I really wish they'd return to the whole foly, fingerstyle clean guitar and distorted riffing type stuff but this isn't bad.

On the other hand love the Mastodon one

Octahedron

Yep - Mastodon's new one, another instant hit with me!! Going to be a good album!!