During the UK leg of the tour, they sang a cover of "Highway to Hell" by AC/DC with Chris Robertson of Black Stone Cherry on vocals, just before the T-shirt cannons.
A similar format was applied during the rest of the tour, however they sang a cover of "Hey Man, Nice Shot" by Filter with Shaun Morgan of Seether on vocals.
During the summer leg of the tour the band sang "Highway to Hell" with Austin John Winkler of Hinder and Jacoby Shaddix of Papa Roach.
On some stops they played "Friends in Low Places" by Garth Brooks and "Tequila Makes Her Clothes Fall Off" by Joe Nichols acoustically.
[1] According to Billboard magazine, Nickelback played in front of 1,046,973 people on the 2009 North American section of the tour.