My new weekly guess :
Paul McCartney, as he's been quite popular recently in Quebec with his show on the Abraham Plains and in the Bell Centre here in Montreal.
He also have quite a lot of good songs to shoot fireworks on, such as Live and Let Die (as seen in "Build a Dream" at the good ol' PGI), Ebony and Ivory (I would see silver ghost shells on this song, to truly link with the song's theme), Band on the Run (comet chases on the intro) and also pick from the songs he composed with the Beatles like he does in his shows.
Does it fit the bill, Mylène ? You should get some prize for the one that finally manages to get it right !
STL