Explanation: This song makes (you) feel good because it's a very calm song with a simple melody. It focuses on staying positive in life even if there are things going wrong. The author's word choices creates a feeling of reassurance, by singing about every day problems of every day people and ending it with "don't worry, be happy" people feel like they are not alone.
Repetition will help a writer emphasize important ideas since repeatedly stating an affirmation will make the idea drastically more obvious and notable to the reader.
