Seth Sentry (born Seth Marton, 1984) is an Australian hip-hop artist from Melbourne, Victoria. Sentry's first public appearances were during live performances with Melbourne hip hop/drum 'n' bass outfit D.S.O.L. in 2003. In 2005, he reached third place in the Revolver Battles competition, in addition to organizing and appearing in a weekly hip hop night at The Old Colonial venue in Fitzroy—Sentry's involvement with the Old Colonial led to an appearance on the The Forthwrite Mixtape in 2007 and a guest appearance on Pez's 2008 album A Mind of My Own.

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