I’ll see you’re “Alone Again, Naturally” and raise you Nilsson’s “Without You”, especially when you realize the two writers of the song wound up hanging themselves.
I'll see your "Without You" and raise you
"Gloomy Sunday", aka the "Hungarian Suicide Song." Although it is arguably the most depressing popular song ever recorded, it was, nonetheless, a global hit, done by many groups in numerous languages, in 1936.
Rezső Seress, who wrote the song, later committed suicide.