Hallo Graham,
I seem to have solved most of my problems:
The errors seem to have been produced by wrong symlinks, perhaps the
result of having both lilypond 2.2.6 and lilypond-snapshot 2.4.2 installed.
The symlink for lilypond is in /usr/share/texmf/tex/lilypond and points
to /usr/share/lilypond
Dear Jan, Mats, and the rest of the lilypond team,
Both of your pieces of advice helped. I was able to successfully get
flat symbol how I wanted it to look in the instrument header line with
this code:
\header{
title = "Surfin' U.S.S.R."
composer = "Toby Dylan Hocking"
instrument = \markup{ Saxo