Another word for the ‘and’ is the ‘swing factor’, a much missed (at least by me!) feature on earlier, simpler arrangers and drum machines.

There was so much ‘groove’ you could impart to a straight style by just a few percentage points of slight swing to the groove. Not enough to hear, just enough to ‘feel’..!

As with most music, the best stuff is the space BETWEEN the notes, not the notes themselves. It’s not what you play, it’s what you DON’T play! 🎹😎
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An arranger is just a tool. What matters is what you build with it..!