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: Black Joke
A: Adderbury
M: 6/8
L: 1/8
K: G
P: A
D | "G" DGG GFG | "C" AcB "D" AGF | "G" GAB "Em" dcB |\
    "Am" AcB "D" AGF | "G" GAB "C" EFG | "D" DEF "G" G3 :|
P: B
B | "G" d2 d d2 d | "C" ede "D" d2 c | "G" B2 d d2 d |\
    "C" ede "D" d2 c | "G" B2 B BAG |
"C" AcB "D" AGF | "G" GAB dcB | "C" AcB "D" AGF |\
"G" GAB "C" EFG | "D" DEF "G" G3 |]