Professional ratings
Aggregate scores
Source	Rating
Metacritic	82/100
Review scores
Source	Rating
AbsolutePunk	93%
Allmusic
The A.V. Club	A
Blabbermouth.net	8/10
Drowned in Sound	10/10
Pitchfork Media	8.7/10.0
PopMatters	10/10

Blood Mountain is the third full-length studio album and major label debut by American heavy metal band Mastodon. The recording of the album finished in April 2006 and it was released on September 12 in the UK and September 12, 2006 in North America through Reprise Records. The album in full could be streamed at the band's MySpace page a few days prior to the release.

Like Mastodon's previous studio work Leviathan, Blood Mountain is a concept album. According to bassist Troy Sanders, "It's about climbing up a mountain and the different things that can happen to you when you're stranded on a mountain, in the woods, and you're lost. You're starving, hallucinating, running into strange creatures. You're being hunted. It's about that whole struggle." Guitarist Bill Kelliher considers this album to represent the earth element. At the time, bassist Troy Sanders called it "sonically the best album we have done." The band's emphasis on clean, melodic vocals instead of the harsher vocals that the band used on their early work continues to grow on this album.

The album includes guest appearances by Scott Kelly of Neurosis on "Crystal Skull", Josh Homme of Queens of the Stone Age on "Colony of Birchmen", as well as keyboard player Isaiah "Ikey" Owens and singer Cedric Bixler-Zavala of The Mars Volta on "Pendulous Skin" and "Siberian Divide", respectively.

The album's last song, "Pendulous Skin", contains a secret "fan letter" from Josh Homme, who provided guest vocals on the album. At 21:25, he says: "Dear Mastodon: My name is Joshua. I'm a big fan from Southern Cal. Really diggin' on your new scene. That's why I hope you don't mind when I got your new demos for your new CD, I had to sing parts on them and send them to you as a tribute. I hope you're not mad about me also uploading them onto the Internet. But hell, it seems like you guys are so cool that you might dig something just like that. Sincerely, your fan, Joshua M. Homme. P.S., Keep it real...REAL (studio effects are used)....*laughter*....REAL." When asked about the message in a Pitchfork Media interview, Homme said, "I was just fucking with them. Then they asked if they could put that on the end of their record, and I was like, 'Yeah.' I did the vocal [for "Colony of Birchmen"] and sent it back to them, and that message was before the song started." The song itself ends at 5:03, followed by over 16 minutes of silence, then Homme's message.

...
Wikipedia