I would like to figure out how voice leading rules could be applied to non-vertical music (non-homophonic music), and when we are not using four-part harmony. I think that Chopin's study op. 25 #1 could be an example of this:
How are met harmonical leading rules in these cases?
In this example, I can see that at the end of the third bar, the seventh note of the dominant goes to the third of the tonic and that the leading note goes to the tonic note. But the order of appearance of these notes along the arpeggio is not respected. Is therefore the order irrelevant, as if all the notes of the arpeggio were gathered and played at the time?
And what about parallel motion? If we gather the notes, I can see that the leading note is duplicated, making parallel octaves and that an inner voice jumps over the highest notes...