Mastodon + Tool = ?
Well according to complex Mathematics that I won't bother to explain because it will blow your mind with non-euclidean formulas and factorials of the square root of the colour known only as "puce", it equals Legend of the Seagullmen.
Now it's not QUITE as exciting as it sounds, as much as Once More 'Round the Sun sung by Maynard James Keenan would have been pants wettingly amazing. This features Singer/Guitarist of Mastodon Brent Hinds (obviously not content with just being in Giraffe Tongue Orchestra), Tool drummer Danny Carey, and Dimitri Coat of Off! and Burning Brides among others.
The band have two tracks out on their website, theseagullmen.com, and they're very much 1950's B-Movie Sea Shanties. For those were expecting Experimental Prog Stoner Rock, this is not that. But it is definitely interesting if nothing else.
We know exactly nothing about what the future holds from Legend of the Seagullmen, but we can assume more material from them will appear before new material from their drummer's other band. It'll be interesting to see where this project goes.
