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:Banbury Bill
A:Bampton
M:C
L:1/4
Q:160
P:A.(AB)3.A
K:D
P:A
| "D" DE FD | "Em" GA B2 | "A7" EF GA/G/ | "D" FG "A7" A A/B/ |
| "D" AD FA | de f e/f/ | "Em" ge "A7" cB/c/ | "D" d2 d A ||
P:B
| "D" de fd  | "A7" cd e2 | "Em" Bc de/d/ | "A7" cB A B/c/ |
  "D" dA A2  | FG A2 | "G" B/c/ d "A7" c/d/e/c/ | "D" d2 d2 |]