diff --git a/assets/bg.ogg b/assets/bg.ogg
new file mode 100644
index 0000000..397bde9
Binary files /dev/null and b/assets/bg.ogg differ
diff --git a/pygame-wasm/phantomcastle/Makefile b/pygame-wasm/phantomcastle/Makefile
index 2420985..22ccc43 100644
--- a/pygame-wasm/phantomcastle/Makefile
+++ b/pygame-wasm/phantomcastle/Makefile
@@ -1,11 +1,11 @@
-assets_files = assets/bg1k.png assets/brick.png assets/coin.png assets/ghost.png assets/win.png
+assets_files = assets/bg1k.png assets/brick.png assets/coin.png assets/ghost.png assets/win.png assets/bg.ogg
 
 all: build/web.zip
 
 assets:
 	mkdir assets
 
-assets/%.png: assets $(../../assets/*.png)
+assets/%: assets $(../../assets/*)
 	cp ../../$@ assets/
 
 build/web: Makefile main.py $(assets_files)
diff --git a/pygame-wasm/phantomcastle/common.py b/pygame-wasm/phantomcastle/common.py
index f6cac23..dfeffe0 100644
--- a/pygame-wasm/phantomcastle/common.py
+++ b/pygame-wasm/phantomcastle/common.py
@@ -12,6 +12,15 @@ import pygame
 from coords import Coords
 
 
+class SingletonMeta(type):
+    _instances = {}
+
+    def __call__(cls, *args, **kwargs):
+        if cls not in cls._instances:
+            cls._instances[cls] = super(SingletonMeta, cls).__call__(*args, **kwargs)
+        return cls._instances[cls]
+
+
 class SurfaceWithRect(NamedTuple):
     surface: pygame.Surface
     rect: pygame.Rect
diff --git a/pygame-wasm/phantomcastle/game/scene.py b/pygame-wasm/phantomcastle/game/scene.py
index a3818fd..3b0b6fc 100644
--- a/pygame-wasm/phantomcastle/game/scene.py
+++ b/pygame-wasm/phantomcastle/game/scene.py
@@ -8,6 +8,7 @@ from game.hero import Hero
 from game.wall import Walls
 from game.coins import Coins
 from game.endlevelmenu import EndLevelMenu
+from sound import BackgroundSound
 
 
 class Scene(DrawableGameObject, EventHandler):
@@ -60,6 +61,8 @@ class Scene(DrawableGameObject, EventHandler):
         self.exit_rect = self.get_exit_rect()
         self.fps = fps
 
+        self.sound = BackgroundSound(self.assets["bg.ogg"])
+
     def get_exit_rect(self) -> pygame.Rect:
         # находим клетку в которой будет выход с карты
         maze_sz = get_maze_sz(self.maze)
@@ -119,11 +122,14 @@ class Scene(DrawableGameObject, EventHandler):
         self.handle_exit(event)
         if self.done:
             return
+        if event.type == pygame.KEYDOWN and event.key == pygame.K_m:
+            self.sound.toggle_mute()
         self.hero.handle_event(event)
         self.check_level_completed()
         self.end.handle_event(event)
 
     async def event_loop(self):
+        self.sound.play()
         clock = pygame.time.Clock()
         while not self.done:
             for event in pygame.event.get():
diff --git a/pygame-wasm/phantomcastle/main.py b/pygame-wasm/phantomcastle/main.py
index b2d4f8f..d58ff05 100644
--- a/pygame-wasm/phantomcastle/main.py
+++ b/pygame-wasm/phantomcastle/main.py
@@ -6,6 +6,7 @@
     После прохождения уровня можно начать новый (кнопкой N) или выйти из игры.
     Также можно управлять мышкой, перетаскивая героя (зажав ЛКМ) и кликая на надпись,
     для начала новой игры.
+    Музыку можно заглушить (или вернуть), нажав на кнопку M.
     
     Это универсальная версия. Подходит для сборки в виде WASM (для браузера) игры,
     с помощью pygbag и для запуска напрямую.
@@ -61,6 +62,7 @@ async def main():
         "brick.png",
         "win.png",
         "coin.png",
+        "bg.ogg",
     ]
     with get_assets_direct(required_assets) as assets:
         await game(assets)
diff --git a/pygame-wasm/phantomcastle/sound.py b/pygame-wasm/phantomcastle/sound.py
new file mode 100644
index 0000000..1ba8458
--- /dev/null
+++ b/pygame-wasm/phantomcastle/sound.py
@@ -0,0 +1,37 @@
+import pygame
+from common import SingletonMeta
+
+
+class BackgroundSound(pygame.mixer.Sound, metaclass=SingletonMeta):
+    def __init__(self, filename):
+        super().__init__(filename)
+        self.set_volume(0.5)
+        self._muted = False
+        self._played = False
+
+    def play(self):
+        if not self._played:
+            super().play(loops=-1)
+            self._played = True
+
+    def mute(self):
+        self._muted = True
+        self.set_volume(0)
+
+    def unmute(self):
+        self._muted = False
+        self.set_volume(0.5)
+
+    @property
+    def muted(self):
+        return self._muted
+
+    @muted.setter
+    def muted(self, value):
+        if value:
+            self.mute()
+        else:
+            self.unmute()
+
+    def toggle_mute(self):
+        self.muted = not self.muted