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.

% -----

\newpage
\section{List of tune first lines}

You know the feeling. Everyone has just launched into a well-loved tune.
You've heard it before, but don't remember the name. So here's a list of
tune first lines to help you figure out what it is in time to join in.

\setlength\LTleft{0pt}
\setlength\LTright{0pt}
\begin{longtable}{lr}