James Donald Root (born October 2, 1971), also known by his number #4, is an American musician, songwriter and guitarist, best known for being the lead guitarist for the American heavy metal band Slipknot, and the former lead guitarist for the American alternative metal band Stone Sour.
Root began performing with the thrash metal band Atomic Opera from Iowa in the early 1990s, not to be confused with the hard rock band Atomic Opera from Houston, Texas. Soon after they split up he went on to perform in bands such as DeadFront and Stone Sour; the latter which he joined in 1995, and returned to along with vocalist Corey Taylor, during its revival in 2002. Prior to joining Slipknot, he worked as a screenprinter, waiter, and busboy.
He joined Slipknot in January 1999, replacing their original guitarist, Josh Brainard, who left the band during the recording of their self-titled album, reportedly after having fulfilled his recording duties. In fact, the only two songs Root recorded during the album's sessions were "Purity" and "Me Inside", the former being featured on the short-lived first pressing of Slipknot as well as the 10th Anniversary Edition, and the latter being its replacement. Despite this, the song has become a staple for most of the band's live performances. Slipknot vocalist Corey Taylor invited Root to join the band based on Taylor's past experiences working with him in Stone Sour.