Two Lights

And if you find out he's coming home
When I come 'round the corner
I know that it's all right
Just leave me two lights
Two Lights by Five for Fighting

If you don't read between the lines, and maybe get a bit of background knowledge, you probably wouldn't understand this pretty cryptic song.
If you take the lyrics at face value, the song can sound... kind of depressing. "Tear out my heart, feed it to lions," "Show me no mercy, spare me my pride" etc. The words just seem to resonate misery and desperation.

And yet, the chorus always has one choice stanza. One that throws all the sadness out the window and replaces it with a cheery message. It's the one at the top of the page, mind you.
Why do I focus on this song? Disregarding bias (because if bias was the reason, I would not be talking about this song), the song is a pretty good message for hope. The protagonist's son has departed for who knows what. While the protagonist is terrified at the thought of losing his son, he (the protagonist) hopes that everything will be all right, and all he needs is one signal - two lights. Light, the universal symbolism for hope.

The song fights between the downtrodden nature of the man's concern and the repeated rise of hope. It communicates that no matter what happens, we should look for "two lights" because it means everything has finally come together for good.