 FACT: Towards the end, when the opera of "Don Juan" is about to be  performed, the conductor takes the stand to conduct the overture. We  briefly see the score (sheet music) for the opera. The first note of  the page has a "tie" on it. This means that the note has been tied  over from a previous note on another page. If this is the overture  of the opera, then there wouldnt be a tie over to the FIRST note.