replace weak examples with verified ensembles

.gitattributes

@@ -39,3 +39,5 @@ examples/neon-groove.mp3 filter=lfs diff=lfs merge=lfs -text
 examples/bach-air-violin-piano.mp3 filter=lfs diff=lfs merge=lfs -text
 examples/double-tracked-pop-rock.mp3 filter=lfs diff=lfs merge=lfs -text
 examples/livery-stable-blues-jazz-band.mp3 filter=lfs diff=lfs merge=lfs -text
+examples/bach-brandenburg-no2-ensemble.mp3 filter=lfs diff=lfs merge=lfs -text
+examples/harry-mitchell-jazz-quartet.mp3 filter=lfs diff=lfs merge=lfs -text

README.md

@@ -16,7 +16,7 @@ A custom ZeroGPU interface for [MuScriptor](https://github.com/muscriptor/muscri
 
 The app runs the 307M-parameter medium checkpoint, streams transcription progress after each 5-second audio window, renders an interactive color-coded piano roll, and exports both the full arrangement and isolated instrument MIDI files.
 
-Three one-click real-music examples are included: a 1920 violin-and-piano performance of Bach's *Air*, the Original Dixieland Jass Band's 1917 *Livery Stable Blues*, and a modern double-tracked pop-rock guitar performance. Their public-domain and Creative Commons provenance is documented in [`examples/README.md`](examples/README.md). Example results are cached lazily after first use so startup never consumes ZeroGPU quota.
+Three one-click real-music examples are included: Bach's *Brandenburg Concerto No. 2* with chamber orchestra, a live modern performance by the Harry Mitchell Quartet, and a double-tracked pop-rock guitar performance. Each example uses verified instrument guidance selected from live quality tests. Their Creative Commons provenance is documented in [`examples/README.md`](examples/README.md). Example results are cached lazily after first use so startup never consumes ZeroGPU quota.
 
 The checkpoint is gated under CC BY-NC 4.0. This Space requires an `HF_TOKEN` secret whose owner has accepted access to [`MuScriptor/muscriptor-medium`](https://huggingface.co/MuScriptor/muscriptor-medium).
 

app.py

@@ -473,12 +473,15 @@ def transcribe_audio(
 
         elapsed = time.perf_counter() - started
         notes = _notes_from_events(events)
-        preview_tracks = _track_payloads(notes, requested)
+        # Instrument hints guide decoding, but a hinted instrument with no
+        # decoded notes is not a real output track. Keep hinted placeholders
+        # during progress, then export only non-empty detections.
+        preview_tracks = _track_payloads(notes)
         track_names = [track["key"] for track in preview_tracks]
         full_path, track_paths, full_bytes, midi_by_instrument = _write_outputs(
             events, track_names
         )
-        tracks = _track_payloads(notes, requested, midi_by_instrument)
+        tracks = _track_payloads(notes, midi_by_instrument=midi_by_instrument)
         print(
             "[MuScriptor Studio] "
             f"{audio_name}: {duration:.2f}s audio, {len(tracks)} tracks, "
@@ -601,30 +604,35 @@ EXAMPLES_HEADING = """
   <div>
     <span class="examples-kicker">Try a session</span>
     <h2>Start with an example</h2>
-    <p>Real performances spanning classical, early jazz and layered pop-rock.</p>
+    <p>Real performances spanning chamber orchestra, modern jazz and layered pop-rock.</p>
   </div>
-  <span class="examples-hint">One click · 10–12 seconds</span>
+  <span class="examples-hint">One click · 10–14 seconds</span>
 </div>
 """
 
 EXAMPLE_ROWS = [
     [
-        str(EXAMPLE_ROOT / "bach-air-violin-piano.mp3"),
-        ["violin", "acoustic_piano"],
+        str(EXAMPLE_ROOT / "bach-brandenburg-no2-ensemble.mp3"),
+        ["trumpet", "flutes", "oboe", "string_ensemble"],
         False,
         1.0,
         1,
     ],
     [
-        str(EXAMPLE_ROOT / "livery-stable-blues-jazz-band.mp3"),
-        ["trumpet", "clarinet", "trombone", "drums"],
+        str(EXAMPLE_ROOT / "harry-mitchell-jazz-quartet.mp3"),
+        ["acoustic_piano", "tenor_sax", "acoustic_bass", "drums"],
         False,
         1.0,
         1,
     ],
     [
         str(EXAMPLE_ROOT / "double-tracked-pop-rock.mp3"),
-        [],
+        [
+            "distorted_electric_guitar",
+            "acoustic_guitar",
+            "electric_bass",
+            "drums",
+        ],
         False,
         1.0,
         1,
@@ -632,8 +640,8 @@ EXAMPLE_ROWS = [
 ]
 
 EXAMPLE_LABELS = [
-    "Bach — Air · 1920 violin & piano · 12s",
-    "Livery Stable Blues · 1917 jazz band · 12s",
+    "Bach — Brandenburg No. 2 · chamber orchestra · 12s",
+    "Harry Mitchell Quartet · live jazz · 14s",
     "Layered Pop-Rock · real guitars & bass · 10s",
 ]
 
@@ -745,7 +753,7 @@ with gr.Blocks(title="MuScriptor — Audio to MIDI") as demo:
                 examples_per_page=3,
                 example_labels=EXAMPLE_LABELS,
                 label=None,
-                elem_id="examples-gallery",
+                elem_id="examples-gallery-v2",
                 api_visibility="private",
                 api_name="load_example",
             )

examples/README.md

@@ -1,22 +1,22 @@
 # Real-music example audio
 
-These examples are excerpts from genuine performances hosted by Wikimedia Commons. Each source, recording license, excerpt range, and modification is documented below. The clips were shortened, given brief edge fades, and transcoded to stereo 44.1 kHz MP3 at 112 kbps for this Space.
+These examples are excerpts from genuine performances hosted by Wikimedia Commons. Each source, recording license, excerpt range, and modification is documented below. The clips were shortened, given brief edge fades, loudness-normalized where needed, and transcoded to compact 44.1 kHz MP3 files for this Space.
 
-## Bach — Air on the G String
+## Bach — Brandenburg Concerto No. 2
 
-- File: `bach-air-violin-piano.mp3`
-- Recording: J. S. Bach, *Air on the G String* (BWV 1068), recorded in 1920; Joel Belov, violin, with Robert Gayler, piano.
-- Source: [Air (Bach).ogg — Wikimedia Commons](https://commons.wikimedia.org/wiki/File:Air_(Bach).ogg)
-- Rights: [Public Domain Mark 1.0](https://creativecommons.org/publicdomain/mark/1.0/); Commons identifies the recording as free of known copyright restrictions, including related and neighboring rights.
-- Modification: excerpt `03:16–03:28`, shortened to 12 seconds, faded at the cut boundaries, and transcoded to MP3.
+- File: `bach-brandenburg-no2-ensemble.mp3`
+- Recording: J. S. Bach, *Brandenburg Concerto No. 2 in F major*, first movement; Vince DiMartino with the Lexington Bach Choir Orchestra. The excerpt features trumpet, recorder/flute, oboe, violin, and ensemble strings.
+- Source: [Brandenburg Concerto No. 2 — Wikimedia Commons](https://commons.wikimedia.org/wiki/File:IMSLP83563_-_Brandenburg_Concerto_No.2_in_F_major,_BWV_1047_(Bach,_Johann_Sebastian)_-_1._(Allegro).ogg)
+- Rights: [Creative Commons Attribution 3.0 Unported](https://creativecommons.org/licenses/by/3.0/).
+- Modification: excerpt `00:04–00:16`, shortened to 12 seconds, loudness-normalized, faded at the cut boundaries, and transcoded to MP3.
 
-## Livery Stable Blues
+## Harry Mitchell Quartet
 
-- File: `livery-stable-blues-jazz-band.mp3`
-- Recording: *Livery Stable Blues* by the Original Dixieland Jass Band, recorded 26 February 1917; cornet, clarinet, trombone, piano, and traps.
-- Source: [1917 alternate edit — Wikimedia Commons](https://commons.wikimedia.org/wiki/File:Original_Dixieland_Jass_Band_-_Livery_Stable_Blues_(1917)_alternate_edit.ogg)
-- Rights: public-domain composition and U.S. public-domain sound recording under 17 U.S.C. § 1401 because it was published before 1926. Adam Cuerden also released the restoration edits into the public domain. The Commons page notes that public-domain status may differ outside the United States.
-- Modification: excerpt `00:28–00:40`, shortened to 12 seconds, faded at the cut boundaries, and transcoded to MP3.
+- File: `harry-mitchell-jazz-quartet.mp3`
+- Recording: a 2022 live performance by pianist Harry Mitchell with Jamie Oehlers on tenor saxophone, Karl Florisson on upright bass, and Ben Vanderwal on drums. The four musicians and instruments are visible in the source video; the lineup is also documented on [Harry Mitchell's official site](https://harrymitchell.net/shows).
+- Source: [Harry Mitchell Quartet recording — Wikimedia Commons](https://commons.wikimedia.org/wiki/File:Harry_Mitchell_Quartet_recording.webm), uploaded by Jack4576.
+- Rights: [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/).
+- Modification: excerpt `00:00.5–00:14.5`, shortened to 14 seconds, faded at the cut boundaries, and transcoded to MP3.
 
 ## Layered Pop-Rock
 

examples/{bach-air-violin-piano.mp3 → bach-brandenburg-no2-ensemble.mp3}

@@ -1,3 +1,3 @@
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-oid sha256:e7f34cae592a9532bbd747ba96ac4a10082095139bffbb622ce0d0759d91e4c0
-size 169004
+oid sha256:352928346fbb50f728e3dde5285d69b2e1322a542e5ca0c25a1e4d87b00c1b6f
+size 193141

examples/{livery-stable-blues-jazz-band.mp3 → harry-mitchell-jazz-quartet.mp3}

@@ -1,3 +1,3 @@
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-size 169004
+oid sha256:c606fc3d041d6f69d0410060b658304ba0a321643a67eeb7770b0df50ffb0ee9
+size 225009