diff --git a/dashboards/merge_files.py b/dashboards/merge_files.py
new file mode 100644
index 0000000..e4cd192
--- /dev/null
+++ b/dashboards/merge_files.py
@@ -0,0 +1,40 @@
+import streamlit as st
+from streamlit_pianoroll import from_fortepyan
+
+from fortepyan import MidiFile
+
+
+def main():
+    st.write("# Test MidiFile merging")
+    uploaded_files = st.file_uploader(
+        label="Upload one or many MIDI files",
+        accept_multiple_files=True,
+    )
+
+    if not uploaded_files:
+        st.write("Waiting for files")
+        return
+
+    midi_files = []
+    for uploaded_file in uploaded_files:
+        midi_file = MidiFile.from_file(uploaded_file)
+        midi_files.append(midi_file)
+
+    merge_spacing = st.number_input(
+        label="merge spacing [s] (time interval inserted between files)",
+        min_value=0.0,
+        max_value=30.0,
+        value=5.0,
+    )
+    merged_midi_file = MidiFile.merge_files(
+        midi_files=midi_files,
+        space=merge_spacing,
+    )
+    st.write("Duration after merge:", merged_midi_file.duration)
+    st.write("Number of notes after merge:", merged_midi_file.piece.size)
+
+    from_fortepyan(merged_midi_file.piece)
+
+
+if __name__ == "__main__":
+    main()
diff --git a/fortepyan/midi/structures.py b/fortepyan/midi/structures.py
index 35f090c..c783b43 100644
--- a/fortepyan/midi/structures.py
+++ b/fortepyan/midi/structures.py
@@ -1,5 +1,5 @@
 import json
-from typing import Optional
+from typing import IO, Optional
 from dataclasses import field, dataclass
 
 import numpy as np
@@ -472,6 +472,22 @@ def piece(self) -> MidiPiece:
         )
         return out
 
+    @classmethod
+    def from_file(cls, midi_file: IO) -> "MidiFile":
+        """
+        Generic wrapper for the pretty_midi.PrettyMIDI interface.
+
+        Args:
+            midi_file (str or file): Path or file pointer to a MIDI file.
+
+        Returns:
+            MidiFile: A new `MidiFile` object containing the input file.
+        """
+        _midi = pretty_midi.PrettyMIDI(midi_file)
+
+        midi_file = cls(_midi=_midi)
+        return midi_file
+
     @classmethod
     def from_piece(cls, piece: MidiPiece) -> "MidiFile":
         _midi = pretty_midi.PrettyMIDI()
diff --git a/pyproject.toml b/pyproject.toml
index 8c7f2b1..01a6427 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -28,8 +28,15 @@ dependencies = [
     "Levenshtein>=0.20.9",
     "cmcrameri>=1.5",
 ]
+
 requires-python = ">=3.9"
 
+[project.optional-dependencies]
+dev = [
+  "pre-commit ~= 3.8.0",
+  "streamlit-pianoroll == 0.7.1"
+]
+
 [project.urls]
 Homepage = "https://github.com/Nospoko/fortepyan"