[WhoOdyssey]

I've noticed that some of the songs seem to be sound-a-like versions and not the originals. In particular at one point Firework was playing but it didn't sound like Katy Perry's vocals. I wonder why that would be?

Either a) they couldn’t get clearance for the original, or b) the cover artist is signed to Simon’s record label.

It’s unlikely to be the latter as Simon no longer has a record label these days.