Music and songs are written at different periods of time, at different times in your life. They reflect the feelings you have and to be honest, I quite like having positive emotions.
Do not think too much of the dead husk of your friend, or mourn too much over it, but send your thoughts out towards the real soul or self which has escaped - to reach it.
Voice comes to you through a spell, a trance. The best voices are not you... they're a little away from you.