Made menu music keep playing across all scenes but game

this was way more annoying than it should have been. Wanna know why?
Godot.

Scripts/MusicManager.cs

@@ -0,0 +1,43 @@
+using Godot;
+
+public partial class MusicManager : Node {
+    private AudioStreamPlayer _player;
+    private Node _lastScene;
+    private AudioStream _menuMusic;
+
+    public override void _Ready() {
+        _player = new AudioStreamPlayer();
+        AddChild(_player);
+
+        _menuMusic = GD.Load<AudioStream>("res://Audio/Music/Menu.mp3");
+
+        _player.Stream = _menuMusic;
+        _player.Play();
+
+        _lastScene = GetTree().CurrentScene;
+    }
+
+    public override void _Process(double delta) {
+        Node currentScene = GetTree().CurrentScene;
+
+        if (currentScene != _lastScene) {
+            OnSceneChanged(currentScene);
+            _lastScene = currentScene;
+        }
+    }
+
+    private void OnSceneChanged(Node newScene) {
+        if (_player == null) return;
+        if (newScene == null) return;
+
+        if (newScene.Name == "Game") {
+            if (_player.Playing)
+                _player.Stop();
+        } else {
+            if (_player.Stream != _menuMusic || !_player.Playing) {
+                _player.Stream = _menuMusic;
+                _player.Play();
+            }
+        }
+    }
+}