It's a bit late to be tagged in anything really since my list is kinda solid, also please stop commenting "this was from 2013". Most everything from 2013 is eligible, deal with it!
#12 - Habits (Stay High) - Tove Lo
This is Tove Lo's first song on the countdown, but was also featured in "Heroes" by Alesso.
Hint for #11: A notable Tengager did a cover of this song this year.