Three Days Grace is a Canadian alternative rock band formed in 1997 and now based in Toronto. Consisting of lead vocalist Matt Walst, lead guitarist Barry Stock, drummer Neil Sanderson, and bassist Brad Walst, the band is best known for their metal-influenced, hard rock sound and clever songwriting.

TDG grew out of Groundswell, a five-member high-school band founded in 1992. With Adam Gontier as lead vocalist, Neil Sanderson as drummer, Brad Walst as bassist, Phil Crowe as lead guitarist, and Joe Grant as rhythm guitarist, Groundswell released one album, Wave of Popular Feeling in 1995. That same year, the band broke up, and it was not until 1997 that Adam Gontier, Neil Sanderson, and Brad Walst got together as “Three Days Grace”.

Working with local producer Gavin Brown, the trio re-worked a number of their past songs and compiled a demo album. After handing it to EMI Music Publishing Canada, TDG produced their smash single “I Hate Everything About You”, which would be released in 2003 alongside their eponymous debut album Three Days Grace through American label Jive Records.

In late 2003, the band welcomed lead guitarist Barry Stock, and released two additional singles, Just Like You and “Home”. Going on tour for TDG’s debut album, lead singer Adam Gontier developed a prescription drug addiction, and with the support of his friends and family, checked into rehab in 2005.

While undergoing treatment, Gontier wrote songs about his journey to recovery, which would become tracks on TDG’s second album. After leaving the center, Gontier continued producing music with the band, culminating in 2006’s One-X. The album was positively received: TDG catapulted to the top of Billboard’s 2007 charts, the single “Animal I Have Become” became the band’s most successful track, and One-X was certified double platinum July 2007 in Canada. Later in 2016, the album would earn triple platinum in the US.

In 2009, TDG released their third album, Life Starts Now, transitioning from the dark lyrics of their previous records into a lighter and more mature era.

In 2011, following the disbanding of Jive Records, TDG signed on to RCA Records. On June 5, 2012, TDG announced their fourth studio album, Transit of Venus, inspired by the rare astrological phenomenon that had occurred that day and released later in October.

In a surprise announcement on January 9, 2013, lead singer Adam Gontier revealed that he was leaving TDG. He was replaced by bassist Brad Walst’s brother Matt Walst, who remains the band’s lead singer today.

In April 2014, the band released their first single of the year, “Painkiller”, which shot to No. 1 on Billboard’s Mainstream Rock Chart in August. The following month, TDG released their next single, “I Am Machine”, and on January 26, 2015, the band confirmed that the title of their next album. In March 2015, TDG released the third single “Human Race”, and a week later, they released their fifth studio album, Human.

Throughout 2015, TDG went on tour, performing in US and Canada, and in early 2016, Europe and Russia. In November 2016, they released a cover single of Phantogram’s “You Don’t Get Me High Anymore”.

Over the summer of 2017, TDG began working on their sixth studio album, “Outsider”, which was released in March 2018. The first single of the album, “The Mountain”, was released January 2018, and followed by “Infra-Red” in June and “Right Left Wrong” in November. All three singles made a No. 1 debut on Billboard’s Mainstream Rock Chart, setting the band a record of 15 smash-hit singles. In 2019, the TDG won iHeart Radio’s Rock Artist of the Year.

In July of 2020, TDG released a cover of Gotye’s “Somebody That I Used To Know”.