Please identify this piece.?!

Please identify this piece.?

I know that this is always portrayed as a love song. Here's the tune - F sharp, up to G, down to B, up to C, up to D, down to A, down to G, up to D. I'm not sure if this is in the right key. Please tell me the composer and name of the piece. Thanks!!

8 hours ago
correction: the last note is c

Tschaikovsky Romeo and Juliet Overture