Don't worry, be happy!
In Brazilian universities' graduation, when they call your name to go pick up your diploma, students are usually allowed to choose a song to be played while you walk your way. I got to know the song "Don't worry, be happy" when my girlfriend asked me to find the file so that she could use in her graduation (she ended-up using the one from the movie "The Devil Wears Prada" - "Suddenly I See" though).
After I got the song and heard for the first time I fell in love. I used to listen to it almost every morning (~7am) while driving to the university (~15min). I believe I like it so much because it's so useful, it passes a true message, besides the melody being nice too.
The song pretty much tells us that worrying doesn't help at all, but just makes you feel worse. Think positively, forget what makes you worry, face the challenges, believe in yourself!
References to the song here: Don't worry, be happy
