Here's a quote from a review of Luke's performance.
" Luke tried to take on one of the greatest singers in rock history, Freddie Mercury of Queen, doing the band’s classic, “Killer Queen,” and it fell completely flat. Randy thought it was “all in all, pretty good,” and Simon said Luke has no charisma or personality – especially when compared to the original"

Yep.. no one can sing like Freddie...

Jean