My Darkest Days is a Canadian post-grunge band based in Toronto, consisting of lead singer Matt Walst, Doug Oliver, Brendan McMillan, and Sal Coz Costa. They were discovered by Chad Kroeger of Nickelback, who signed them up for his production company, 604 Records. The band was founded by Walst, who was born in Norwood, Ontario, and whose older brother Brad Walst is the bassist for Three Days Grace. Instead of playing in his brother's band, Matt decided to form one of his own with his friends McMillan on bass guitar and Oliver on drums and Paulo Neta on lead guitar. In 2009, a friend introduced him to Toronto-based singer-guitarist Sal Coz Costa, who later became the band's guitarist, replacing Neta who became the guitarist for Thornley. When Kroeger heard My Darkest Days, he was so impressed he immediately signed them to his record label. The first song they wrote after signing was "Porn Star Dancing," which became their first single. Kroeger decided he wanted to be featured on it, along with a friend of his, Zakk Wylde, frontman/guitarist for Black Label Society and a former guitarist for Ozzy Osbourne. Kroeger and Wylde both appear in the video, which was filmed at the Hard Rock Las Vegas Vanity nightclub. There is also a remix of the single featuring rapper Ludacris. They released their new debut self-titled album on September 21, 2010. The song "Set It On Fire" features Australian singer/guitarist Orianthi, known from her work with Steve Vai, Carlos Santana and Michael Jackson on leadguitar. On October 26, 2010 the "Saw 3D" soundtrack released through SonyMusic Independent Network (SIN) and Artists' Addiction Records featured their single "The World Belongs to Me."