Schubert's Ave Maria
You probably don't have to guess which of those two is my personal favorite, but I obviously enjoy both.
Luciano Pavarotti liked to say of his own talent "I know that God kissed my vocal chords." He understood that his talent was a gift from God, and he used that gift to touch the world through music. He turned a lot of people on to opera that wouldn't otherwise be fans-I was one of them.
I fear that music fans will never know another who is anything like him. When Pavarotti is laid to rest today, it will be with a white tie and tails, and a rosary in his hands.