lib/head_music/circle.rb in head_music-0.1.0 vs lib/head_music/circle.rb in head_music-0.1.1

@@ -17,9 +17,13 @@
   def initialize(interval)
     @interval = HeadMusic::Interval.get(interval.to_i)
     @pitch_classes = pitch_classes_by_interval(interval)
   end
 
+  def index(pitch_class)
+    @pitch_classes.index(HeadMusic::Spelling.get(pitch_class).pitch_class)
+  end
+
   private_class_method :new
 
   private
 
   def pitch_classes_by_interval(interval)