Create app.py

app.py

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+import streamlit as st
+import streamlit_pianoroll
+from datasets import load_dataset
+from fortepyan import MidiPiece
+
+dataset = load_dataset("epr-labs/maestro-sustain-v2", split="train")
+piece = MidiPiece.from_huggingface(dataset[312])
+
+streamlit_pianoroll.from_fortepyan(piece)