What key is Carry on Wayward Son in?

C Major

What tuning is a day to remember in?

The main tunings employed by A Day to Remember are dropped C (C G C F A D), dropped B (B Fs B E Gs Cs) and dropped As (As F As Ds G C). Released during the year of A Day to Remember’s 10th anniversary, Common Courtesy has something of a retrospective feel.