diff --git a/play.py b/play.py
index ee5ef1c..d33cc06 100644
--- a/play.py
+++ b/play.py
@@ -613,7 +613,7 @@ def pick_track():
                     pass
             stdscr.addstr(3, max(0, (w - 15) // 2), "─" * 15,
                           curses.color_pair(2))
-            stdscr.addstr(4, max(0, (w - 56) // 2), "↑/↓ navigate  ↵ play  r render  a play all  R render all  q quit",
+            stdscr.addstr(4, max(0, (w - 68) // 2), "↑/↓ navigate  ↵ play  s sheet  r render  a play all  R render all  q quit",
                           curses.A_DIM)
 
             # Track list
@@ -711,6 +711,10 @@ def pick_track():
                 result[0] = entries[selected[0]][0]
                 action[0] = "play"
                 return
+            elif key == ord("s"):
+                result[0] = entries[selected[0]][0]
+                action[0] = "sheet"
+                return
             elif key == ord("r"):
                 result[0] = entries[selected[0]][0]
                 action[0] = "render"
@@ -765,6 +769,8 @@ examples:
                       help="Show score metadata and stats")
     insp.add_argument("--parts", action="store_true",
                       help="List all parts with details")
+    insp.add_argument("--sheet", action="store_true",
+                      help="Open sheet music (ABC notation) in browser")
 
     play = p.add_argument_group("playback")
     play.add_argument("--from", dest="from_measure", type=int, metavar="N",
@@ -857,6 +863,32 @@ def _render_and_cache(path, args):
     return buf, sr, offset_sec, score, mod
 
 
+def _open_sheet(path):
+    """Render a track's score as ABC notation and open sheet music in the browser."""
+    import tempfile
+    import webbrowser
+
+    score, mod = load_score(path)
+    title = get_title(mod, Path(path))
+
+    # Derive ABC key from the module's Key object (e.g. Key("Eb", "minor"))
+    abc_key = "C"
+    if hasattr(mod, "key"):
+        k = mod.key
+        root = getattr(k, "tonic_name", "C")
+        mode = getattr(k, "mode", "major")
+        abc_key = str(root)
+        if "minor" in mode.lower():
+            abc_key += "m"
+
+    html = score.to_abc(title=title, key=abc_key, html=True)
+
+    out = Path(tempfile.gettempdir()) / f"{Path(path).stem}_sheet.html"
+    out.write_text(html)
+    webbrowser.open(f"file://{out}")
+    print(f"  Sheet music -> {out}")
+
+
 def _play_track(path, args, force_render=False, render_only=False):
     """Load, render, and play a single track. Uses cached WAV if available.
     Returns 'next', 'prev', or None."""
@@ -1046,6 +1078,8 @@ def main():
                             print(f"  ✗ {f.name}: {e}")
 
                 print(f"\n  Done! {done[0]} tracks cached.\n")
+            elif act == "sheet":
+                _open_sheet(path)
             elif act == "render":
                 _play_track(path, args, force_render=True)
             else:
@@ -1070,8 +1104,8 @@ def main():
         print(f"File not found: {path}")
         sys.exit(1)
 
-    # ── Info / parts (no playback) ────────────────────────────────
-    if args.info or args.parts or args.midi:
+    # ── Info / parts / sheet (no playback) ──────────────────────────
+    if args.info or args.parts or args.midi or args.sheet:
         score, mod = load_score(path)
         if args.bpm:
             score.bpm = args.bpm
@@ -1081,6 +1115,8 @@ def main():
             show_info(score, mod, path)
         elif args.parts:
             show_parts(score)
+        elif args.sheet:
+            _open_sheet(path)
         elif args.midi:
             score.save_midi(args.midi)
             print(f"Exported MIDI -> {args.midi}")
diff --git a/pyproject.toml b/pyproject.toml
index 14c0d4f..d91c8b3 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -8,7 +8,7 @@ authors = [
 ]
 requires-python = ">=3.10"
 dependencies = [
-    "pytheory>=0.40.9",
+    "pytheory>=0.41.2",
 ]
 
 [tool.uv]
diff --git a/uv.lock b/uv.lock
index df8866c..fbdeece 100644
--- a/uv.lock
+++ b/uv.lock
@@ -97,7 +97,7 @@ dependencies = [
 ]
 
 [package.metadata]
-requires-dist = [{ name = "pytheory", specifier = ">=0.40.9" }]
+requires-dist = [{ name = "pytheory", specifier = ">=0.41.2" }]
 
 [[package]]
 name = "markdown-it-py"
@@ -287,7 +287,7 @@ wheels = [
 
 [[package]]
 name = "pytheory"
-version = "0.40.9"
+version = "0.41.2"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "rich" },
@@ -295,9 +295,9 @@ dependencies = [
     { name = "scipy", version = "1.17.1", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version >= '3.11'" },
     { name = "sounddevice" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/7e/cf/0366e974c27261de5219a032637512b3b7594118dfb5a219700a96e49445/pytheory-0.40.9.tar.gz", hash = "sha256:5a15b9c15c94d81f794edec5dbe03fc0c58a0bd08233777a62209df197755b2b", size = 187008, upload-time = "2026-04-03T03:15:15.939Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/d4/55/625d43b77c96bcd7eb0782c34c55dd9c0fba831e47e74af1f14f8d9088ff/pytheory-0.41.2.tar.gz", hash = "sha256:86eb9484921e2be2451215fba293e6daa55a1339593acb96dc061024097577e0", size = 188842, upload-time = "2026-04-07T11:44:13.51Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/db/87/3d0fb3cb84c8d199e2cf4807259524119912335211c2ee2531a9dc5c3527/pytheory-0.40.9-py3-none-any.whl", hash = "sha256:d9bad930c6e38d684fb75519ea989dc93331cb71628fbd47cf3449b9316fb730", size = 191155, upload-time = "2026-04-03T03:15:17.308Z" },
+    { url = "https://files.pythonhosted.org/packages/86/69/4fc3bd3580ad45f05f2f3e6a77ac637b0b12f663c5999685b712d521e502/pytheory-0.41.2-py3-none-any.whl", hash = "sha256:90298eb5df74ad187e512faac0856458b4b906905e4d1eeb24c02a972599fc5f", size = 193031, upload-time = "2026-04-07T11:44:14.705Z" },
 ]
 
 [[package]]