"Don't worry, Be Happy" by Bobby McFerrin really does work! I fell so positive after watching the video! Try it!
There was a rumour a while ago that Bobby McFerrin committed suicide, which would have been the ultimate irony, had this been true.
However, according to the internettles, there is a real life counterpart to this rumour, as in 1942, the chap who wrote "Pack Up Your Troubles In Your Old Kit Bag and Smile, Smile, Smile" took his own life by shooting himself in the heart, whilst wearing his old army uniform.
"Don't worry, Be Happy" was the first acapella track to top the US charts, and was inspired by this:
It's a "inspiraton"card from a chap called Meher Baba, a spiritual master, who plyed his trade from the 30s to the 60s, and inspired this song:
"Baba O'Riley" by The Who, was voted 340th on the Rolling Stone Top 500 songs of all time, incidentally, one place higher than "Don't Worry, Be Happy" at 341!