Oh nice you have your full list in the original post. Makes things much easier for me!
Your first five have three of my fav pop songs of 2015. Though GFY and everything off Revival > THWWIW
Second five- Carly <3 and Biebs had some good beats this year but I still dont like his voice or his face.
3rd - Totalky forgot about FourFive Seconds. Great song.
4th- i dont think ive heard any of these
5th - Baby I'm your nightmare dressed as a daydream.
6th - Is it offensive to name the Adele fanbase Adelephants? Such a perfect name. And Ellie!!!
Keep it pumping yo