Honestly, yeah.
It took next to zero effort, and it was a product I liked enough to have recommended even if the only thing I had gotten was the first sample.
It’s really the best kind of marketing I’ve ever run across. They made it so that the only work involved was handing something small to someone, plus the original feedback. If the product had sucked, even that effort wasn’t mandatory.
There isn’t a single one.
But, I’d have to give the nod to either “fade to black”, Metallica; or “closer to fine”, the Indigo Girls
Fade to Black should be obvious. It’s the lyrics, the feel of the song, etc.
Closer to fine isn’t really about the actual lyrics, it’s about the sentiment of them, of moving through life and reaching new places and becoming. You get closer to fine by whatever path you’re on. So, when shit is real, it’s nice to have the reminder.