Marcus "Marc" Byrd (born 1970) is an American musician, writer, and producer best known as one-half of the post-rock/ambient duo Hammock with Andrew Thompson.Since its formation in 2005, Hammock has released ten full-length albums and five EPs. One review of Hammock's 2013 record Oblivion Hymns remarked that Hammock "...has gone on to become one of the foremost purveyors of affecting ambient post-rock on the scene." Byrd was also involved in the 2006 ambient art project The Sleepover Series, Volume One, which featured five solo tracks written and performed by Byrd.

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