There are a few tunes that you turn up and hum along to when they come on. “What Becomes of the Brokenhearted” by Jimmy Ruffin ticks the box for me. It’s one of those weird ones though, a song that has a kind of uplifting melodic line but some pretty sad lyrics.
Quick edit: Oh man, and “Crying” by Roy Orbison, and “Heaven Help Us All” by Stevie Wonder, and “Bye Bye Love” by the Everly Brothers. (Solid playlist on right now, clearly.) That last one will always have the softest spot in my heart.