Logos is the second studio album from ambient experimental project Atlas Sound. It was released on October 19, 2009, in Europe by 4AD, and on October 20 in the US by Kranky Records. The album features guest contributions from Noah Lennox (a.k.a. Panda Bear of Animal Collective) and Stereolab's Laetitia Sadier. Units ordered directly from Rough Trade came packaged with a bonus six-song EP of leftover material. The album reached #7 on the Billboard Heatseekers album chart. The cover art is an image of Bradford Cox, who has Marfan syndrome, and is inspired by the artwork of his previous release.
An unmastered and unfinished version of Logos was accidentally leaked in 2008 by frontman Bradford Cox via his own Mediafire account. The incident caused an outrage from Cox, who posted on his blog that he felt what was leaked was simply a "sketch" of what he intended to be the final product, and was not meant to be released publicly. He almost abandoned the project, but continued to work on the album shortly after the incident. A leak of the finalized version of the album surfaced on September 1, 2009.
The album's first single "Walkabout" was made available for streaming and download on 4AD's website. A music video was also produced for the song "Quick Canal." The video was directed by Flitz Vladich, and premiered on 4AD's website on October 19, 2009.
Logos received positive reviews from music critics. At Metacritic, which assigns a normalized rating out of 100 to reviews from mainstream critics, the album received an average score of 81, based on 26 reviews, indicating "Universal Acclaim".