Three Days Grace is a Canadian rock band formed in Norwood, Ontario in 1997. Based in Toronto, the band's original line-up consisted of guitarist and lead vocalist Adam Gontier, drummer and backing vocalist Neil Sanderson, and bassist Brad Walst. In 2003, Barry Stock was recruited as the band's lead guitarist, making them a four-member band. In 2013, Gontier left the band and was replaced by My Darkest Days' vocalist Matt Walst, who is also the younger brother of bassist Brad Walst. In 2024, Gontier officially rejoined the band with Walst also remaining as a singer, making them a quintet.