My Darkest Days was a Canadian rock band based in Peterborough, Ontario, consisting of lead vocalist Matt Walst, bassist Brendan McMillan, drummer Doug Oliver, guitarist Sal Costa, and keyboardist Reid Henry. They were discovered by Chad Kroeger of Nickelback, who signed them to his record label, 604 Records. They are best known for their 2010 single "Porn Star Dancing".

Matthew Jean Paul Walst is a Canadian singer, songwriter and musician. He is the current lead singer of the band Three Days Grace, which also includes his older brother Brad as bassist. Before joining Three Days Grace, he was the lead singer of My Darkest Days.