+@cindex accordion discant symbols
+@cindex discant symbols, accordion
+@cindex accordion shifts
+
+@c FIXME: use @notation, not @q.
+
+Accordions are often built with more than one set of reeds that may be
+in unison with, an octave above, or an octave below the written pitch.
+Each accordian maker has different names for the @q{shifts} that
+select the various reed combinations, such as @q{oboe}, @q{musette}, or
+@q{bandonium}, so a system of symbols has come into use to simplify
+the performance instructions.