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: Jamie Allen
M: C
L: 1/4
Q: 160
K: Gmaj
|: G/A/ | "G" B G G A | B2 G A/B/ | "D7" c A A B | c2 B A |
"G" G g "C" g e | "G" d2 B B/c/ | "D7" d d c/B/ A | "G" G3 :|
|: B/A/ | "G" G g g f | e d c B | "D7" A a a g | f d e f |
"G" g>a "C" g e | "G" d2 B B/c/ | "D7" d d c/B/ A | "G" G3 :|