diff --git a/OpenUtau/Controls/TrackBackground.cs b/OpenUtau/Controls/TrackBackground.cs
index 0b4a1e441..27425b2ee 100644
--- a/OpenUtau/Controls/TrackBackground.cs
+++ b/OpenUtau/Controls/TrackBackground.cs
@@ -30,6 +30,11 @@ class TrackBackground : TemplatedControl {
                 nameof(IsKeyboard),
                 o => o.IsKeyboard,
                 (o, v) => o.IsKeyboard = v);
+        public static readonly DirectProperty<TrackBackground, int> KeyProperty =
+            AvaloniaProperty.RegisterDirect<TrackBackground, int>(
+                nameof(Key),
+                o => o.Key,
+                (o, v) => o.Key = v);
 
         public double TrackHeight {
             get => _trackHeight;
@@ -47,11 +52,16 @@ public bool IsKeyboard {
             get => _isKeyboard;
             set => SetAndRaise(IsPianoRollProperty, ref _isKeyboard, value);
         }
+        public int Key {
+            get => _key;
+            set => SetAndRaise(KeyProperty, ref _key, value);
+        }
 
         private double _trackHeight;
         private double _trackOffset;
         private bool _isPianoRoll;
         private bool _isKeyboard;
+        private int _key;
 
         public TrackBackground() {
             MessageBus.Current.Listen<ThemeChangedEvent>()
@@ -62,7 +72,8 @@ protected override void OnPropertyChanged(AvaloniaPropertyChangedEventArgs chang
             base.OnPropertyChanged(change);
             if (change.Property == TrackHeightProperty ||
                 change.Property == TrackOffsetProperty ||
-                change.Property == ForegroundProperty) {
+                change.Property == ForegroundProperty ||
+                change.Property == KeyProperty) {
                 InvalidateVisual();
             }
         }
@@ -77,7 +88,6 @@ public override void Render(DrawingContext context) {
             }
             int track = (int)TrackOffset;
             double top = TrackHeight * (track - TrackOffset);
-            int key = DocManager.Inst.Project == null ? 0 : DocManager.Inst.Project.key;
             string[] degreeNames;
             switch(Preferences.Default.DegreeStyle){
                 case 1:
@@ -112,7 +122,7 @@ public override void Render(DrawingContext context) {
                         toneTextLayout.Draw(context, new Point());
                     }
                     //scale degree display
-                    int degree = mod(tone - key, 12);
+                    int degree = mod(tone - Key, 12);
                     string degreeName = degreeNames[degree];
                     var degreeTextLayout = TextLayoutCache.Get(degreeName, brush, 12);
                     var degreeTextPosition = new Point(4, (int)(top + (TrackHeight - degreeTextLayout.Height) / 2));
diff --git a/OpenUtau/ViewModels/NotesViewModel.cs b/OpenUtau/ViewModels/NotesViewModel.cs
index c2a1d1fd5..3a319f43c 100644
--- a/OpenUtau/ViewModels/NotesViewModel.cs
+++ b/OpenUtau/ViewModels/NotesViewModel.cs
@@ -43,6 +43,7 @@ public class NotesViewModel : ViewModelBase, ICmdSubscriber {
         [Reactive] public double TickOffset { get; set; }
         [Reactive] public double TrackOffset { get; set; }
         [Reactive] public int SnapDiv { get; set; }
+        [Reactive] public int Key { get; set; }
         public ObservableCollectionExtended<int> SnapTicks { get; } = new ObservableCollectionExtended<int>();
         [Reactive] public double PlayPosX { get; set; }
         [Reactive] public double PlayPosHighlightX { get; set; }
@@ -108,6 +109,7 @@ public class NotesViewModel : ViewModelBase, ICmdSubscriber {
         private string? portraitSource;
         private readonly object portraitLock = new object();
         private int userSnapDiv = -2;
+        private int userKey => Project.key;
 
         public NotesViewModel() {
             SnapDivs = new List<MenuItemViewModel>();
@@ -317,8 +319,8 @@ private void UpdateSnapDiv() {
         }
 
         private void UpdateKey(){
-            int key = Project.key;
-            KeyText = "1="+MusicMath.KeysInOctave[key].Item1;
+            Key = userKey;
+            KeyText = "1="+MusicMath.KeysInOctave[userKey].Item1;
         }
 
         public void OnXZoomed(Point position, double delta) {
diff --git a/OpenUtau/Views/PianoRollWindow.axaml b/OpenUtau/Views/PianoRollWindow.axaml
index 0dd283d6e..579338222 100644
--- a/OpenUtau/Views/PianoRollWindow.axaml
+++ b/OpenUtau/Views/PianoRollWindow.axaml
@@ -59,6 +59,7 @@
                          DataContext="{Binding NotesViewModel}"
                          TrackHeight="{Binding TrackHeight}"
                          TrackOffset="{Binding TrackOffset}"
+                         Key="{Binding Key}"
                          PointerWheelChanged="KeyboardPointerWheelChanged"
                          PointerPressed="KeyboardPointerPressed"
                          PointerMoved="KeyboardPointerMoved"