BGM kept looping after exiting credits_a3, which is not what we want.

tetris/modes/credits_a3.lua

@@ -44,6 +44,7 @@ function CreditsA3Game:advanceOneFrame(inputs, ruleset)
 				self.roll_frames = 150
 			else
 				self.game_over = true
+				switchBGM(nil)
 			end
 		end
 	end

tetris/modes/marathon_a1.lua

@@ -12,7 +12,6 @@ MarathonA1Game.hash = "MarathonA1"
 MarathonA1Game.tagline = "Can you score enough points to reach the title of Grand Master?"
 
 
-
 function MarathonA1Game:new()
     MarathonA1Game.super:new()