Periphery is the debut studio album by American progressive metal band Periphery. It was released on April 20, 2010 through Sumerian Records, and was produced by the band themselves and Matt Murphy. Many songs on the tracklist had been written long before the release date—with some written by original lead vocalist Casey Sabol—but due to membership changes, the album was postponed on several occasions. Former vocalist Chris Barretto had nearly finished recording the album before he and the band parted ways months before its release. Rather than release the songs with Barretto's vocals, the band decided to rerecord Barretto's songs with Spencer Sotelo; however, Sotelo only re-worked a few of the melodies when recording vocals, versus writing completely new lyrics. As a result, Sabol's and Barretto's lyrics and vocal melodies and harmonies are still featured on the record. The album was re-released on February 6, 2012 as a 'Special Edition' including instrumentals, along with a new song "Passenger", originally recorded by guitarist Mark Holcomb during his time in the band Haunted Shores.[2] This is the only album to feature guitarist Alex Bois and bassist Tom Murphy.