Name of a song from Charmed

[shinyshiny]

The song appeared in an episode of "Charmed" and was supposedly sung by one of the actors (right..) ..either way, I'm wondering if it's a real song, as the melody and all sounded really old.. from the 1920's I guess. It was in the episode where one of the sisters has to go back to one of her previous lives (supposedly 1920), where her two sisters run an illegal pub, they had a party, and she is planning to kill the two sisters together with a demon named Anton.
All I remember is that it's a really simple song accompanied by a piano, the lyric starts something like this:

"If she was the only girl in the world, and I was the only boy.."

[ursula62]

Try this link...

http://www.rienzihills.com/SING/ifyouweretheonlygirlinth eworld.htm