fix noob mistake, still goes boom

OpenRA.Game/Widgets/Delegates/MusicPlayerDelegate.cs

@@ -43,17 +43,25 @@ namespace OpenRA.Widgets.Delegates
 				return true;
 			};
 			bg.GetWidget("BUTTON_NEXT").OnMouseUp = mi => {
+				Sound.PlayMusic(GetNextSong());
 				Sound.MusicPaused = false;
 				bg.GetWidget("BUTTON_PLAY").Visible = false;
 				bg.GetWidget("BUTTON_PAUSE").Visible = true;
 				return true;
 			};
 			bg.GetWidget("BUTTON_PREV").OnMouseUp = mi => {
+				Sound.PlayMusic(GetNextSong());
 				Sound.MusicPaused = false;
 				bg.GetWidget("BUTTON_PLAY").Visible = false;
 				bg.GetWidget("BUTTON_PAUSE").Visible = true;
 				return true;
 			};
 		}
+		
+		string GetNextSong()
+		{
+			//goes boom here
+			return Rules.Music["AllMusic"].Pools.Value["Music"].GetNext();	
+		}
 	}
 }

mods/ra/mod.yaml

@@ -50,4 +50,7 @@ Voices:
 Terrain:
 	mods/ra/terrain.yaml
 	
+Music:
+	mods/ra/music.yaml
+
 ShellmapUid:b22b0197b126d6236a7c1e18c3001c83af10156c