There are some upbeat songs that are just upbeat, and there are some that deal with surprisingly dark subject matter, like these four.

And while reading happiness quotes or listening to love songs can also offer a pick-me-up, nothing lifts you out of a funk ...

"I never get tired of singing it," insists Tucker, who fell in love with the tune upon first hearing it in producer Billy Sherrill's office. "When the song was finished, I said, ‘That's my song!'" ...