@item
@strong{Whitespace insensitive}:
-it does not matter how many spaces (or new lines) you add.
+it does not matter how many spaces (or tabs or new lines) you add.
@w{@code{@{ c d e @}}} means the same thing as
@w{@code{@{ c @tie{}} @tie{} @tie{} d e @}} and:
@}
@end example
+However, whitespace @emph{is} required to separate many syntactical
+elements from others. In other words, whitespace can always be
+@emph{added}, but it cannot be @emph{eliminated}. As missing
+whitespace can give rise to strange errors it is advisable to
+always insert whitespace before and after every syntactic element,
+for example, before and after every curly brace.
+
@item
@strong{Expressions}:
every piece of LilyPond input needs to have @strong{@{ curly
Polyphonic music in lilypond, while not difficult, uses concepts
that we haven't discussed yet, so we're not going to introduce
-them. Instead, the following sections introduce these concepts
+them here. Instead, the following sections introduce these concepts
and explain them thoroughly.
@seealso
-Learning Manual: @ruser{Voices contain music}.
+Learning Manual: @ref{Voices contain music}.
+
Notation Reference: @ruser{Simultaneous notes}.
@node Songs