The band was formed by Maria Christopher, formerly of Dirt Merchants, and Ayal Naor[1] in 1997.
Maria Christopher and Ayal Naor, of 27, contributed to the songs "Weight," "Carry," and "The Beginning and the End" which appeared on the Isis album Oceanic.
[1] Of these, the song "Weight" was featured on the television show Friday Night Lights in 2007.
[1] 27 also released an album on Hydra Head Records, which is owned by Aaron Turner of Isis.
As of 2014, Adam McGrath from Cave In has been playing live guitar in 27.