It seems like David Guetta always goes back to Sia for vocals on his tracks. Looking at it objectively, you cant really blame him for it either, she has an amazing voice and with the way he now produces music, it is a great combination that results in plenty of radio and online pop/top 40 station plays.
Flames, honestly, sounds like a track that would be on a Sia album more than a David Guetta Album. The instrumentals sound more like live instruments than samples that Guetta usually uses. Nonetheless, if you are a Sia fan, I am sure you will like the track. Check it out below.