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:Banks of the Dee, The
M:6/8
S:Bacon (Williams MSS)
A:Ascott-under-Wychwood
O:English
R:Jig
P:A.(AB)5
K:G
I:speed 300
P:A
|: G | "G" DEF GAB | "C" ced "G" cBA | "Em" BGE "D" Ddc | "G" BcA "D" G2  :|
P:B
|: G/2A/2 | "G" Bcd d2 g | "C" ede "G" dBG | Bcd "Em" efg |
   "G" GAG "D" FED | "C" cec "G" BdB  | "D" GFG "G" AFD |\
   GFE "D7" Ddc | BcA "G" G2  :|