It depends on the song. Sounds boring and obvious, but it's true.
Dido shouldn't have worked, Aerosmith shouldn't have worked, Skylar shouldn't have worked..
But they did (more for Dido and Aerosmith) because the song and combination were right.
It's like, I think Jamie N Commons should fit Em well.. However, they could fuck it up. You can't just get two dope people on a track and assume people'll like it.
Sia is talented, has some lungs on her, and seems to have an alternative attitude as opposed to most of 'Pop'.
So who knows. As long as it's a tight beat and Em comes strong, I have all the confidence that she'll do something worthwhile.