One-X is the second studio album by Canadian rock band Three Days Grace. It was produced by Howard Benson and is the band's first album recorded as a four-piece band, as Barry Stock joined the group and took over lead guitar from lead singer Adam Gontier. It is their first and only album under Sony BMG, the successor to Sony Music Entertainment's original roots and Bertelsmann Music Group. The Sony BMG joint venture was dropped in 2008, which led to Bertelsmann's Sony BMG stake going back to Sony.
