Make output larger where possible. This is done by a) reducing the page margins b) compressing the heading and removing all but Notes: fields. The latter produced vertically smaller tune PDFs that will scale wider. In the process, modify abctitle.py to extract the first of any header field, and move formatting for a single tune into a .fmt file.

%abc
X:1
T:Shave the Donkey
M:4/4
S:Bacon (RD)
A:Bampton
O:English
R:Reel
P:A.(AB3)3.A
K:G
I:speed 300
P:A
|: d2 B2 dcBA | G2 g2 e2 g2 | d2 B2 dcBA | G2 B2 G4 :|
P:B
|: A3 c B2 d2 | A3 c  B2 d2 | A3 c c2 e2 | dcBA  G4 :|