Three Days Grace

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 quartet. In 2013, Gontier left the band and was replaced by Walst's younger brother Matt, who was a longtime songwriter for the band and was previously the lead singer of My Darkest Days. In 2024, Gontier officially rejoined the band with Walst also remaining as a singer, making them a dual-vocalist band, as well as a quintet for the first time since their genesis as Groundswell.
Currently signed to RCA Records, they have released eight studio albums: Three Days Grace in 2003, One-X in 2006, Life Starts Now in 2009, Transit of Venus in 2012, Human in 2015, Outsider in 2018, Explosions in 2022 and Alienation in 2025. The first three albums have been RIAA certified 3× platinum, 5× platinum, and 4× platinum, respectively, and the following two have both been certified gold, in the United States. In Canada, they have been certified by Music Canada as platinum, triple platinum, and double platinum, respectively. In the United Kingdom and New Zealand, their second album, One-X, was certified gold by the British Phonographic Industry and the Recorded Music NZ, respectively. The band has 21 No. 1 songs on the Billboard Hot Mainstream Rock Tracks chart and had 3 No. 1 hits on the Alternative Songs chart.
As of 2022, the band has sold over 10 million albums and singles combined worldwide.