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!
#20 - Paradise - Within Temptation ft. Tarja
This is Within Temptation's first appearance on my countdown, as well as Tarja's.
Hint for #19: Someone on one of my favorite competition shows did an amazing cover of this song.