Happy songs make me sad.
Seriously, isn’t ‘Hushabye’ by the Beach Boys a strangely depressing song? The words all about loving someone and looking after them, and the music is this reassuringly familiar chord sequence. The vocals are stunningly beautiful (particularly on the vocal mix found on the Good Vibrations box set), and the final result is somehow… depressing. Not in a bad way, just in a way that slightly chokes me up.