diff --git a/modules/juce_audio_utils/gui/juce_MidiKeyboardComponent.cpp b/modules/juce_audio_utils/gui/juce_MidiKeyboardComponent.cpp
index 700469f11d..3365c45f1d 100644
--- a/modules/juce_audio_utils/gui/juce_MidiKeyboardComponent.cpp
+++ b/modules/juce_audio_utils/gui/juce_MidiKeyboardComponent.cpp
@@ -194,21 +194,19 @@ Range<float> MidiKeyboardComponent::getKeyPosition (int midiNoteNumber, float ta
 {
     jassert (midiNoteNumber >= 0 && midiNoteNumber < 128);
 
-    static const float blackNoteWidth = 0.7f;
-
-    static const float notePos[] = { 0.0f, 1 - blackNoteWidth * 0.6f,
-                                     1.0f, 2 - blackNoteWidth * 0.4f,
+    static const float notePos[] = { 0.0f, 1 - blackNoteWidthRatio * 0.6f,
+                                     1.0f, 2 - blackNoteWidthRatio * 0.4f,
                                      2.0f,
-                                     3.0f, 4 - blackNoteWidth * 0.7f,
-                                     4.0f, 5 - blackNoteWidth * 0.5f,
-                                     5.0f, 6 - blackNoteWidth * 0.3f,
+                                     3.0f, 4 - blackNoteWidthRatio * 0.7f,
+                                     4.0f, 5 - blackNoteWidthRatio * 0.5f,
+                                     5.0f, 6 - blackNoteWidthRatio * 0.3f,
                                      6.0f };
 
     auto octave = midiNoteNumber / 12;
     auto note   = midiNoteNumber % 12;
 
     auto start = octave * 7.0f * targetKeyWidth + notePos[note] * targetKeyWidth;
-    auto width = MidiMessage::isMidiNoteBlack (note) ? blackNoteWidth * targetKeyWidth : targetKeyWidth;
+    auto width = MidiMessage::isMidiNoteBlack (note) ? blackNoteWidthRatio * targetKeyWidth : targetKeyWidth;
 
     return { start, start + width };
 }
@@ -568,6 +566,17 @@ float MidiKeyboardComponent::getBlackNoteLength() const noexcept
     return whiteNoteLength * blackNoteLengthRatio;
 }
 
+void MidiKeyboardComponent::setBlackNoteWidthProportion (float ratio) noexcept
+{
+    jassert (ratio >= 0.0f && ratio <= 1.0f);
+
+    if (blackNoteWidthRatio != ratio)
+    {
+        blackNoteWidthRatio = ratio;
+        resized();
+    }
+}
+
 void MidiKeyboardComponent::resized()
 {
     auto w = getWidth();
diff --git a/modules/juce_audio_utils/gui/juce_MidiKeyboardComponent.h b/modules/juce_audio_utils/gui/juce_MidiKeyboardComponent.h
index 87865035dd..981da4216e 100644
--- a/modules/juce_audio_utils/gui/juce_MidiKeyboardComponent.h
+++ b/modules/juce_audio_utils/gui/juce_MidiKeyboardComponent.h
@@ -177,6 +177,17 @@ public:
     */
     float getBlackNoteLength() const noexcept;
 
+    /** Sets the width of the black notes as a proportion of the white note width. */
+    void setBlackNoteWidthProportion (float ratio) noexcept;
+
+    /** Returns the width of the black notes as a proportion of the white note width. */
+    float getBlackNoteWidthProportion() const noexcept             { return blackNoteWidthRatio; }
+
+    /** Returns the absolute width of the black notes.
+        This will be their vertical or horizontal width, depending on the keyboard's orientation.
+    */
+    float getBlackNoteWidth() const noexcept                       { return keyWidth * blackNoteWidthRatio; }
+
     /** If set to true, then scroll buttons will appear at either end of the keyboard
         if there are too many notes to fit them all in the component at once.
     */
@@ -380,6 +391,7 @@ private:
 
     MidiKeyboardState& state;
     float blackNoteLengthRatio = 0.7f;
+    float blackNoteWidthRatio = 0.7f;
     float xOffset = 0;
     float keyWidth = 16.0f;
     Orientation orientation;