I am asking about bars 13-19 in the first movement of J.S. Bach's Italian Concerto (BWV 971; sheet music). My ear always hears bar 13 plus the first crotchet of 14 as one extended bar of 3/4 and then the bar lines following that shifted forward a crotchet to the middle of each bar for 14-19 with a one-crotchet bar at the end of 19 to get back in sync with the written bar lines. Should I keep hearing it like this or train my ear to hear it as written?
I think one advantage of an “as writ” interpretation is that the pattern in the left hand in bar 15 becomes twice as often in 21-24, increasing the energy prior to the semi-quavers in 25-26, but it doesn't seem so natural to phrase the left hand this way. Should I maybe bring out the right hand in 15-21 more than the left to help with respecting where the bar lines are, even though the left has the more interesting part and the right seems more of an accompaniment?