diff --git a/src/transformers/models/pop2piano/feature_extraction_pop2piano.py b/src/transformers/models/pop2piano/feature_extraction_pop2piano.py
index 738b93235..89fb04907 100644
--- a/src/transformers/models/pop2piano/feature_extraction_pop2piano.py
+++ b/src/transformers/models/pop2piano/feature_extraction_pop2piano.py
@@ -448,3 +448,6 @@ class Pop2PianoFeatureExtractor(SequenceFeatureExtractor):
         )
 
         return output
+
+
+__all__ = ["Pop2PianoFeatureExtractor"]
diff --git a/src/transformers/models/pop2piano/processing_pop2piano.py b/src/transformers/models/pop2piano/processing_pop2piano.py
index 280e5dc79..11afcab31 100644
--- a/src/transformers/models/pop2piano/processing_pop2piano.py
+++ b/src/transformers/models/pop2piano/processing_pop2piano.py
@@ -137,3 +137,6 @@ class Pop2PianoProcessor(ProcessorMixin):
     def from_pretrained(cls, pretrained_model_name_or_path, **kwargs):
         args = cls._get_arguments_from_pretrained(pretrained_model_name_or_path, **kwargs)
         return cls(*args)
+
+
+__all__ = ["Pop2PianoProcessor"]
diff --git a/src/transformers/models/pop2piano/tokenization_pop2piano.py b/src/transformers/models/pop2piano/tokenization_pop2piano.py
index 5ad0996c1..18adb2e96 100644
--- a/src/transformers/models/pop2piano/tokenization_pop2piano.py
+++ b/src/transformers/models/pop2piano/tokenization_pop2piano.py
@@ -714,3 +714,6 @@ class Pop2PianoTokenizer(PreTrainedTokenizer):
             return BatchEncoding({"notes": notes_list, "pretty_midi_objects": pretty_midi_objects_list})
 
         return BatchEncoding({"notes": notes_list})
+
+
+__all__ = ["Pop2PianoTokenizer"]