Add piano-midi-de dataset

app.py

@@ -8,6 +8,7 @@ from datasets import load_dataset, Dataset
 def main():
     available_datasets = [
         "pijamia-midi-v1",
+        "piano-midi-de",
         "lakh-lmd-full",
         "giant-midi-sustain-v2",
         "maestro-sustain-v2",