Sting? Wow, that's kind out of left field. I just had a quick look at the Wikipedia page for the All-Star game, and it seems like the halftime shows are either "urban" or hip-hop, or showcase local artists. Either of which Toronto has in spades.
Sting is just about the last person you would think of being linked to NBA basketball. Aside from Dame Edna, I mean.
What a weird choice.