Singing is a way of releasing an emotion that you sometimes can't portray when you're acting. And music moves your soul so music is the source of the most intense emotions you can feel. When you hear a song and you're acting it's incredible. But when you're singing a song and you're acting it's even more incredible.
Lots of people I know have bootlegged tapes of performances and if they play it I will be transported back sometimes with happiness sometimes with horror.
I will never forget experiencing Venice for the first time. It feels like you are transported to another time - the art music food and pure romance in the air is like no other place.