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: Shooting
T: Beaux of London City
A: Adderbury
M: 9/8
L: 1/8
P: 6(2A.3B)
K: G
P: A
"" D | "G" G2 G BAG B<dD | GDG B2 "D" A A2 D |\
       "G" G2 G BAG B<dD | GDG B2 "D" A "G" G3 :|
P: B
"G" d2 c B>AG B/d-d | "D" A2 A A2 "G" B "D" c3 |\
"G" d2 c B>AG B/ d2 | GDG B2 "D" A "G" G3 :|