-In this example, @code{\simultaneous } indicates that both music
-fragments happen at the same time, and must be printed stacked
-vertically. The notation @code{<< .. >>} can also be used as a
-shorthand for @code{\simultaneous @{ .. @}}.
-
-The command @code{\new} introduces a ``notation context''. To
-understand this concept, imagine that you are performing a piece of
-music. When you are playing, you combine the symbols printed at a
-certain point with contextual information. For example, without
-knowing the current clef, and the accidentals in the last measure, it
-would be impossible to determine the pitch of a note. In other words,
-this information forms a context that helps you decipher a
-score. LilyPond produces notation from music, so in effect, it does
-the inverse of reading scores. Therefore, it also needs to keep track
-of contextual information. This information is maintained in
-``notation contexts.'' There are several types of contexts,
-e.g. @code{Staff}, @code{Voice} and @code{Score}, but also
-@code{Lyrics} and @code{ChordNames}. Prepending @code{\new} to a chunk
-of music indicates what kind of context to use for interpreting it,
-and ensures that the argument is interpreted with a fresh instance of
-the context indicated.