Render tune title, subtitle and composer in Latex/HTML and not in the image. This way the titles remains a constant size even if the image needs to be scaled. And we have that text appearance under our control. I can't find a way of switching off the tune title in abcm2ps, and have worked around by setting the title format to Y0. Y is not a defined ABC header and is not found in any Dottes tune.

X: 1
T: Exploding Potato, The
C: Ed Pritchard
N: Change: ExtensionReel.abc
M: C
L: 1/4
Q: 180
K: Gmaj
"G" d B/G/ d B/G/ | d e d B | "Am" A>B c A | "D" D B c ^c |
"G" d B/G/ d B/G/ | d e d B | "D7" A>B c A | "G" G2 G2 :|
"D" A>F D D | "Em7" B>G D D | "Am" A B c e | "D" d B "G" [gBD] z |
"D" A>F D D | "Em7" B>G D D | "D7" A B c F | "G" G2 G2 :|