Thanks Lazz !!!!! (And thanks, John, for responding!) That is just the kind of info I need. I have enough of a background in music theory (years of school band, choir, etc.) to easily understand what you demonstrate, and your examples are clear and useful. My impression is: one doesn't worry about at what beat within a measure a change might occur, but that by supplying this much info (the info you include in your samples) you provide enough for another musician to quickly pick up on the rest as together you work on the song. That's great; now all I have to do is come up with the time to create these charts for my songs.
Thanks again!
JB