Like fellow Georgia prog-metal behemoths Mastodon, Savannah's Baroness get heavy and heady on their third album. They also bite off a little more than they can chew on Yellow & Green, a concept album of sorts, split into two separate works and filled with the tricky, twisty instrumental chops and complex songcraft that have gained Mastodon a following outside of typical metal fan bases. Don't bother searching for a tidy theme among the 18 songs scattered among the two records; it's the minor-chord brooding, genre experiments, and epic thrust of the music that tie it all together. Tracks like "Take My Bones Away," "March to the Sea," and "Eula" reveal a growing interest in melody and structure that isn't just about the push and plunder. And frontman John Baizley has never sounded more at ease with his surroundings, finding peace among the ruins.