Quote Originally Posted by Fingers View Post
When you switch to jazz, the "music" (the iRealB lead sheet or chart) is just diagrammatic, because the music (melody, rhythm, and harmony) has moved into your head, i.e., between your ears, no longer in front of your eyes. You get to (you are forced to, you are free to) choose how to syncopate, whether and how to alter chords or even reharmonize, to make up your own melodic line, etc, using the outline of the chart as a starting place.
Nevertheless, there are times when it would be useful to be able to say that a chord is supposed to be pushed or pulled half a beat as an indication to the player(s).