In the opening bars of this c-sharp minor nocturne, we have the famous descending scales that are played twice, first in piano then in pianissimo. Here's a snapshot (source) of the part in question:
Question: The lower curved line connecting the two c sharps of the right hand, (i.e. between the 2nd and 3rd chords of right hand, similarly between 4th and 5th chords), does this line correspond to a slur in which case the two chords are played in a legato or does it correspond to a tie, in which case the c sharp note is only played in the starting chord but held down during the following chord?
- Finally, what is the general rule in distinguishing between slurs and ties?