Update

generator/pitch.py

@@ -41,10 +41,10 @@ def shift_key(key: dict, steps: int, semitones: int) -> dict:
       result['custom'] = True
   if 'cancel' in key:
     # A cancellation references the old signature, not a count of naturals.
-    cancelled = shift_key(key_from_fifths(key['cancel']), steps, semitones)
-    if cancelled.get('custom'):
+    canceled = shift_key(key_from_fifths(key['cancel']), steps, semitones)
+    if canceled.get('custom'):
       raise ValueError('transposed key cancellation cannot be represented by fifths')
-    result['cancel'] = cancelled['fifths']
+    result['cancel'] = canceled['fifths']
   return result
 
 def concert_document(document: dict, *, octave_transposing: bool = False) -> dict: