Three Days Grace is a rock band based in Canada. The band was formed under the name of Groundswell in Norwood, Ontario, Canada in 1992, their line-up consists of guitarist and lead vocalist Adam Gontier, drummer and back up vocalist Neil Sanderson, bassist and back up vocalist Brad Walst, and lead guitarist Barry Stock.

Upon completion of their first album, self-titled Three Days Grace, the band recruited Barry Stock to help with lead guitar to give Gontier breathing room on stage and on tour. The album's lead single, "I Hate Everything About You" reached number two on the US Modern Rock and number one on the Mainstream Rock charts and number two on the Canadian Rock charts. Their second single "Just Like You" gave the group a second number-one in Canada and also hit number one on rock charts in the US. This was soon followed by the release of the single "Home" which also turned out to be a radio success.

In 2007, Gontier recorded a song called "I Don't Care" with the band Apocalyptica. The entire band is currently on tour with Breaking Benjamin and Seether, two other modern rock bands. Also, live, Gontier has sung with Seether in the song "Broken". He sings it as a duet by singing Amy Lee's part. In addition, Gontier teamed with Breaking Benjamin's Benjamin Burnley to sing "Dance With the Devil" on tour.

On August 11, 2008, the band posted on their myspace page, a commercial for their first ever live DVD, entitled Live at the Palace. The DVD was released on Tuesday, August 19, 2008, and is available exclusively at Best Buy, as well as several other stores online in other countries including Australia stores such as BIGW, EzyDVD and Sanity.