onodrim

Mozart's opera's are the most easily accessible and enjoyable for an opera newbie, I would suggest starting there. Opera recordings can be very expensive though, so perhaps check one out from your local library first, see if you really like it or not.

And like Redlemon said, use this as a chance to talk to this girl. I'm sure she would be happy to know you were touched by her voice, and also let you know what she was singing.

__________________
"The world is so exquisite with so much love and moral depth, that there is no reason to deceive ourselves with pretty stories for which there’s little good evidence. Far better it seems to me, in our vulnerability, is to look death in the eye and to be grateful every day for the brief but magnificent opportunity that life provides"
-Carl Sagan