+In some cases standard notation is still used, with the
+pitch differences being implicit. For example,
+@notation{Arabic music} is notated with standard
+semitone and quarter-tone accidentals, with the precise
+pitch alterations being determined by context. Italian
+note names are typically used, while the init file
+@file{arabic.ly} provides a suitable set of macros
+and definitions extending the standard
+notation. For more details, see
+@ref{Arabic music}.
+
+@cindex tuning, non-Western
+
+Other types of music require extended or unique notations.
+@notation{Turkish classical music} or Ottoman music, for
+example, employs melodic forms known as @notation{makamlar},
+whose intervals are based on 1/9 divisions of the whole tone.
+Standard Western staff notes are still used, but with special
+accidentals unique to Turkish music, that are defined in the file
+@file{makam.ly}. For further information on Turkish classical
+music and makamlar, see
+@ref{Turkish classical music}.
+
+To locate init files such as @file{arabic.ly} or
+@file{makam.ly} on your system, see
+@rlearning{Other sources of information}.