+@node Titles explained
+@unnumberedsubsubsec Titles explained
+
+Each @code{\book} block in a single input file produces a separate
+output file, see @ref{File structure}. Within each output file
+three types of titling areas are provided: @emph{Book Titles} at the
+beginning of each book, @emph{Bookpart Titles} at the beginning of
+each bookpart and @emph{Score Titles} at the beginning of each score.
+
+Values of titling fields such as @code{title} and @code{composer}
+are set in @code{\header} blocks. (For the syntax of @code{\header}
+blocks and a complete list of the fields available by default see
+@ref{Default layout of bookpart and score titles}). Book Titles,
+Bookpart Titles and Score Titles can all contain the same fields,
+although by default the fields in Score Titles are limited to
+@code{piece} and @code{opus}.
+
+@code{\header} blocks may be placed in four different places to form
+a descending hierarchy of @code{\header} blocks:
+
+@itemize
+
+@item
+At the top of the input file, before all @code{\book},
+@code{\bookpart}, and @code{\score} blocks.
+
+@item
+Within a @code{\book} block but outside all the @code{\bookpart} and
+@code{\score} blocks within that book.
+
+@item
+Within a @code{\bookpart} block but outside all @code{\score} blocks
+within that bookpart.
+
+@item
+After the music expression in a @code{\score} block.
+
+@end itemize
+
+The values of the fields filter down this hierarchy, with the values
+set higher in the hierarchy persisting unless they are over-ridden
+by a value set lower in the hierarchy, so:
+
+@itemize
+
+@item
+A Book Title is derived from fields set at the top of the input file,
+modified by fields set in the @code{\book} block. The resulting
+fields are used to print the Book Title for that book, providing that
+there is other material which generates a page at the start of the
+book, before the first bookpart. A single @code{\pageBreak} will
+suffice.