diff --git a/Zframework/bgm.lua b/Zframework/bgm.lua
index cd2d2c89..b4f45289 100644
--- a/Zframework/bgm.lua
+++ b/Zframework/bgm.lua
@@ -1,4 +1,5 @@
 local BGM={
+	default=false,
 	getList={},
 	getCount=function()return 0 end,
 	play=NULL,
@@ -8,6 +9,9 @@ local BGM={
 	--nowPlay=[str:playing ID]
 	--playing=[src:playing SRC]
 }
+function BGM.setDefault(bgm)
+	BGM.default=bgm
+end
 function BGM.init(list)
 	BGM.init=nil
 	local min=math.min
@@ -56,6 +60,7 @@ function BGM.init(list)
 		BGM.loadOne=nil
 
 		function BGM.play(s)
+			if not s then s=BGM.default end
 			if SETTING.bgm==0 then
 				BGM.nowPlay=s
 				BGM.playing=Sources[s]
diff --git a/main.lua b/main.lua
index 2989cf7a..7a76d5bf 100644
--- a/main.lua
+++ b/main.lua
@@ -354,3 +354,4 @@ do
 end
 
 BG.setDefault(FESTIVAL=="Xmas"and"snow"or"space")
+BGM.setDefault(FESTIVAL=="Xmas"and"mXmas"or"blank")
\ No newline at end of file
diff --git a/parts/scenes/customGame.lua b/parts/scenes/customGame.lua
index 68267eb6..2f0f396e 100644
--- a/parts/scenes/customGame.lua
+++ b/parts/scenes/customGame.lua
@@ -28,7 +28,7 @@ function scene.sceneInit()
 	end
 end
 function scene.sceneBack()
-	BGM.play(FESTIVAL=="Xmas"and"mXmas"or"blank")
+	BGM.play()
 end
 
 function scene.keyDown(key)
diff --git a/parts/scenes/intro.lua b/parts/scenes/intro.lua
index a815386a..1ebb8141 100644
--- a/parts/scenes/intro.lua
+++ b/parts/scenes/intro.lua
@@ -10,7 +10,7 @@ local t1,t2,r
 
 function scene.sceneInit()
 	BG.set()
-	BGM.play(FESTIVAL=="Xmas"and"mXmas"or"blank")
+	BGM.play()
 	t1,t2=0,0--Timer
 	r={}--Random animation type
 	for i=1,8 do r[i]=rnd(5)end