Music moves, music soothes and most important, music can improve your mood. Press play on these happy songs for a boost of cheer. The power of music is no joke—it can affect our mind, body and mood.

Every year we mark a momentous day in the world of media, especially for those of us of a certain age. That's Sept. 21, the exact date mentioned in one of the happiest songs of all time, “September” ...