Now I'm absolutely certain, not just quite certain, although I was wrong about one thing:
The whole idea is a tribute band, so, in essence, it is Marc's band.
Here's how I know:
'His band' is referring to downhere. If you read the first post in this thread it is referring to an award show they were performing at in Canada. I think the article was poorly written and caused confusion because they mention the QE right before stating that "Marc and his band will rock the audience with classic Queen songs". That sentence shouldn't have been the last one. The QE tribute band is not Marc's band and had nothing to do with the award gala in Canada.
Oh, I know it's gonna be a hard day
And you won't come out of this the same, no
But my love will be your strength for tonight
We'll take it one small step, two at a time...