diff --git a/CREDITS.md b/CREDITS.md
index 6f01434..7b420af 100644
--- a/CREDITS.md
+++ b/CREDITS.md
@@ -4,4 +4,5 @@
 
 - Overworld : Kevin MacLeod - Itty Bitty 8 Bit
 - Level 1 : Jeremy Blake - Powerup
-
+- Level 2 : Quincas Moreira - Robot City
+- Level 3 : Kubbi - Up In My Jam
diff --git a/gamedata/game.py b/gamedata/game.py
index c33238e..32c6460 100644
--- a/gamedata/game.py
+++ b/gamedata/game.py
@@ -51,8 +51,10 @@ class Game():
                             mapdico["filler"] = pygame.image.load(i.path).convert_alpha()
                         else:
                             mapdico["tilesets"][i.name] = pygame.image.load(i.path).convert_alpha()
-                    if name=="bgm.mp3":
-                        mapdico["bgm"] = pygame.mixer.Sound(i.path)
+                    if len(name)==7:
+                        if name.startswith("bgm"):
+                            if name.endswith(".wav") or name.endswith(".ogg") or name.endswith(".mp3"):
+                                mapdico["bgm"] = pygame.mixer.Sound(i.path)
                 except:
                     self.log("Erreur",mapfolder,name,"Fichier invalide")
                 if name=="map.json":
diff --git a/gamedata/maps/Level 1/bgm.mp3 b/gamedata/maps/Level 1/bgm.mp3
deleted file mode 100644
index 9ba49ed..0000000
Binary files a/gamedata/maps/Level 1/bgm.mp3 and /dev/null differ
diff --git a/gamedata/maps/Level 1/bgm.ogg b/gamedata/maps/Level 1/bgm.ogg
new file mode 100644
index 0000000..73042f1
Binary files /dev/null and b/gamedata/maps/Level 1/bgm.ogg differ
diff --git a/gamedata/maps/Level 2/bgm.mp3 b/gamedata/maps/Level 2/bgm.mp3
deleted file mode 100644
index c64eabe..0000000
Binary files a/gamedata/maps/Level 2/bgm.mp3 and /dev/null differ
diff --git a/gamedata/maps/Level 2/bgm.ogg b/gamedata/maps/Level 2/bgm.ogg
new file mode 100644
index 0000000..7e21856
Binary files /dev/null and b/gamedata/maps/Level 2/bgm.ogg differ
diff --git a/gamedata/maps/Level 3/bgm.mp3 b/gamedata/maps/Level 3/bgm.mp3
deleted file mode 100644
index c64eabe..0000000
Binary files a/gamedata/maps/Level 3/bgm.mp3 and /dev/null differ
diff --git a/gamedata/maps/Level 3/bgm.ogg b/gamedata/maps/Level 3/bgm.ogg
new file mode 100644
index 0000000..2fad027
Binary files /dev/null and b/gamedata/maps/Level 3/bgm.ogg differ
diff --git a/gamedata/objects/levels.py b/gamedata/objects/levels.py
index 56cdb99..55e9307 100644
--- a/gamedata/objects/levels.py
+++ b/gamedata/objects/levels.py
@@ -11,7 +11,7 @@ class Levels(BaseObject):
             self.nodes.append(i.copy())
         self.customvalues = customvalues
 
-        self.bgm = self.game.sound_lib["bgm/overworld.mp3"]
+        self.bgm = self.game.sound_lib["bgm/overworld.ogg"]
         self.bgm.play(-1)
 
         self.sfx = self.game.sound_lib["sfx/mapmove.wav"]
diff --git a/gamedata/sounds/bgm/overworld.mp3 b/gamedata/sounds/bgm/overworld.mp3
deleted file mode 100644
index ed2a205..0000000
Binary files a/gamedata/sounds/bgm/overworld.mp3 and /dev/null differ
diff --git a/gamedata/sounds/bgm/overworld.ogg b/gamedata/sounds/bgm/overworld.ogg
new file mode 100644
index 0000000..ea0ea8f
Binary files /dev/null and b/gamedata/sounds/bgm/overworld.ogg differ