Move Change: notice closer to the bottom of the tune graphic. I was using \begin{center}..\end{center} to centre the tune graphic, followed by the change notice, if any. But this leaves a paragraph gap after the center section and hence a gap between tune graphic and change notice. Change to use figures to position the graphic, include the change notice as a caption, and use {\centering} around the image to centre just the image.

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−X: 1
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−T: Constant Billy
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−A: Headington
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−M: 6/8
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−L: 1/8
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−P: A(AB)4
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−K: G
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−P: A
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−D |: "G" GBd B2 B | "D7" cBc A2 A | "G" BAG "C" EFG | "D7" DEF "G" G2 D :|
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−P: B
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−|: "G" Bcd "C" ecB | "D7" ABc "G" dBG | "G" Bcd "C" ecB | "Am" ABc "D7" def |
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−"G" g2 d B2 B | "D7" cBc A2 A | "G" BAG "C" EFG | "D7" DEF "G" G3 :|