In the happy scenes there were really fun times. Sean would say really funny stuff because he likes to improv. I would want to laugh, but you are not allowed to do that during the take.
Such happiness as life is capable of comes from the full participation of all our powers in the endeavor to wrest from each changing situations of experience its own full and unique meaning.
We human beings are tuned such that we crave great melody and great lyrics. And if somebody writes a great song, it's timeless that we as humans are going to feel something for that and there's going to be a real appreciation.