Octahedron is the fifth studio album by American progressive rock band The Mars Volta, released on June 23, 2009 by Warner Bros. in North America and Mercury Records worldwide. Omar Rodríguez-López had discussed the band's next album as early as January 2008, the month that The Bedlam in Goliath was released, claiming "I consider it to be our acoustic album." Cedric Bixler Zavala has also spoken of the album as "acoustic" and "mellow," yet stated: "We know how people can be so linear in their way of thinking, so when they hear the new album, they're going to say, 'This is not an acoustic album! There's electricity throughout it!' But it's our version. That's what our band does -- celebrate mutations. It's our version of what we consider an acoustic album." On April 22, 2009, the album's first single, Cotopaxi, was played as the "hottest record in the world" for that day on the Zane Lowe BBC Radio One show. An e-mail sent to people who had signed up to The Mars Volta's newsletter on May 16 confirmed details of the album and provided a link streaming four songs (Since We've Been Wrong, Cotopaxi, With Twilight as My Guide, and Desperate Graves) upon inserting one of the band's four previous studio albums into the disc tray of the user's computer. The promotion also provided a chance to win a pair of tickets to their show at the ICA, London on June 18 and a link to pre-order the digipack, limited edition of the album exclusive to HMV. It was also noted that Omar Rodríguez-Lópe