My Darkest Days is an post-grunge band from Norwood, Ontario. The band consists of four members: Matt Walst (vocals) Sal Costa (guitar) Brendan McMillan (bass), and Doug Oliver (drums). When they play live, they have Reid Henry on keyboards and guitar. Their former guitarist, Paulo Neta, left the band in late 2009 and was replaced by Sal. Their debut album came out September 21, 2010. Matt Walst is the brother of Three Days Grace’s bassist, Brad Walst.

Source: http://www.last.fm/music/My+Darkest+Days/+wiki