<Tr> <Th> Past members </Th> <Td> <Ul> <Li> Adam Gontier </Li> </Ul> </Td> </Tr> <Ul> <Li> Adam Gontier </Li> </Ul> <P> 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 Three Days Grace a four - member band . In 2013, Gontier left the band and was replaced by My Darkest Days' vocalist Matt Walst, who is also bassist Brad Walst's brother . </P> <P> Signed with Jive Records, Three Days Grace has released six studio albums, each at three - year intervals: Three Days Grace in 2003, One - X in 2006, Life Starts Now in 2009, Transit of Venus in 2012, Human in 2015, and Outsider in 2018 . The first three albums have been RIAA certified 2x platinum, 3 × platinum, and platinum, respectively, in the United States . In Canada, they have been certified by Music Canada as platinum, double platinum, and platinum, respectively . The band has a string of number one songs on the Billboard Alternative Songs and Hot Mainstream Rock Tracks charts . </P>

When did matt walst join three days grace