I think this is a tongue in cheek Decemberists self-satire. The title refers to previous Decemberists track "Summersong," which tells the story of a shipwreck where the crew drowns. Colin Meloy humorously refers to his songs like this with morbid lyrics as "singalong suicide" songs. But then the singer says because he's tired of writing these morbid songs, he is going to kill himself, ironically making this another singalong suicide song.
I think this is a tongue in cheek Decemberists self-satire. The title refers to previous Decemberists track "Summersong," which tells the story of a shipwreck where the crew drowns. Colin Meloy humorously refers to his songs like this with morbid lyrics as "singalong suicide" songs. But then the singer says because he's tired of writing these morbid songs, he is going to kill himself, ironically making this another singalong suicide song.