This one song has done what so many often struggle to do, or unfortunately will never do, capture a audience from all walks of life. Young, old, rich, poor, blue collar, white collar, different races and religions. It really reminds me of the multi-talented collaboration of "We Are The World", with the late Michael Jackson. That song spread like wild flower and was heard across the oceans, and the song "Happy" is doing exactly that.
It's just a feel good kind of tune, that no matter what you are going through in life, no matter how you are feeling today, or what is going on around you, hear this song on the radio, or play it on your personal device or at home, and it puts you in a whole other frame of mind. A better frame of mind. No, it may not take the problem away, but it can change your thoughts. It puts you in a mood called "Happy", and who doesn't want that feeling.