Three Days Grace

Three Days Grace is a Canadian alternative rock band. They formed in 1992 in Norwood, Ontario as a post-grunge band and were originally called "Groundswell". There are four members in the band: Adam Gontier, Barry Stock, Neil Sanderson and Brad Walst. The band was named "Number One Rock Artist of the Year" by Billboard. 
Gontier resigned from the band on January 9, 2013 due to a "non-life threatening" health issue and was replaced by My Darkest Days lead singer Matt Walst.