It's very hard to just say which song is the greatest of all time. It would be better to categorize it, so you said "best rap song ever", or "best pop song ever". That way, you won't get as much hate!
people on hltv and their taste for music ... don't ask
Somewhere only we know-Keane
All of me-John Legend
Let her go-Passenger
Demons and basically all of imagine dragons