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.

X: 1
T: Old Tom of Oxford
M: C|
L: 1/4
K: Gmaj
B/c/ | "D" d e/f/ "G" g d | "D" c B A B/A/ | "G" G B/c/ d g | "D" f g a f/e/ |
       "D" d e/f/ "G" g d | "D" c B A e/f/ | "G" g d c B | "D" A B/A/ "G" G :|
z/A/ | "G" B d B d | "G" B d g/f/e/d/ | "C" c e c e | "C" c e g/f/e/d/ |
       "G" B d B c | "D" d e/f/ "G" g d | "G" g d c B | "D" A B/A/ "G" G :|