Revert attempt at getting Change: notices closer to music in print. My previous attempt appeared to work, but didn't actually centre graphics if the graphic was less than page width. Revert, and instead add a \vfill before the tune to leave more blank space between multiples tunes on a page, It's more obvious then which tune the change belongs to. Not idea, but the best I can do for now.

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\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}