Changes to get Beginners booke building. The web pages include prev and next links, so to get those right we have to make the tune filenames distinct from the main booke names. So fall back to taking the easy way, and just prefix all tune names with @ or _.

% Notes page

\chapter{Notes}

% Pad pages to multiple of 4.
\newcounter{frontpages}
\setcounter{frontpages}{3 + \thelastfrontmatterpage}
\padpages{4}{\thefrontpages}