Singing For What You Like

I noticed that in both clips the character singing was singing for joy. At that moment both men were joyful for their moment. One was singing in the rain because he was in love. This movie was meant to be romantic and family oriented. On the other hand, the other movie was about pain, rock and roll and drugs. So at the time the character was singing while inducing pain, that was his way of a joyful moment. He was in a state of fun. He loves to hurt people and the people he was hurting at that time he was truly enjoying. So both movies are different but the state of mind both were at the time of the singing was the same.