diff --git a/.jules/palette.md b/.jules/palette.md
index c05638899..bed894d40 100644
--- a/.jules/palette.md
+++ b/.jules/palette.md
@@ -1,3 +1,7 @@
 ## 2024-05-19 - Replace HTML disabled with aria-disabled="true" for Accessible Tooltips
 **Learning:** Native HTML `disabled` attributes completely hide elements from screen readers and block all pointer/hover events, preventing tooltips from functioning for disabled elements.
 **Action:** Replace `disabled` with `aria-disabled="true"`, enforce block click handlers via `e.preventDefault()`, and add a title tooltip directly to the element to maintain full tooltip accessibility and keyboard focus support for visually impaired and mouse users.
+
+## 2024-08-16 - Add tooltips to icon-only buttons
+**Learning:** Icon-only buttons often have an `aria-label` for screen reader users, but without a `title` attribute, mouse users hovering over the button receive no visual hint about its function, degrading usability.
+**Action:** Always add a `title` attribute matching the `aria-label` to icon-only buttons to provide native browser tooltips on hover.
diff --git a/apps/desktop/src/features/score/ScoreView.tsx b/apps/desktop/src/features/score/ScoreView.tsx
index 72732450f..53cab32fc 100644
--- a/apps/desktop/src/features/score/ScoreView.tsx
+++ b/apps/desktop/src/features/score/ScoreView.tsx
@@ -198,6 +198,7 @@ export function ScoreView({ song, projectId, onSongUpdate }: ScoreViewProps) {
                       onClick={projectId ? () => void handleRemove(projectId, attachment) : undefined}
                       disabled={!projectId}
                       aria-label={`${t("scoreRemove")}: ${attachment.fileName}`}
+                      title={`${t("scoreRemove")}: ${attachment.fileName}`}
                       className="size-10 border-rose-300/25 text-rose-200 hover:bg-rose-400/10"
                     >
                       <Trash2 className="size-4" aria-hidden="true" />
diff --git a/apps/desktop/src/features/score/ScoreViewer.tsx b/apps/desktop/src/features/score/ScoreViewer.tsx
index 82692469e..ee5536c36 100644
--- a/apps/desktop/src/features/score/ScoreViewer.tsx
+++ b/apps/desktop/src/features/score/ScoreViewer.tsx
@@ -258,6 +258,7 @@ export function ScoreViewer({ data, fileName, onStatusChange }: ScoreViewerProps
               size="icon-lg"
               className="size-12"
               aria-label={t("scoreViewerZoomOut")}
+              title={t("scoreViewerZoomOut")}
               onClick={zoomOut}
             >
               <ZoomOut aria-hidden="true" />
@@ -267,6 +268,7 @@ export function ScoreViewer({ data, fileName, onStatusChange }: ScoreViewerProps
               size="icon-lg"
               className="size-12"
               aria-label={t("scoreViewerZoomIn")}
+              title={t("scoreViewerZoomIn")}
               onClick={zoomIn}
             >
               <ZoomIn aria-hidden="true" />
@@ -275,6 +277,7 @@ export function ScoreViewer({ data, fileName, onStatusChange }: ScoreViewerProps
               variant={fitWidth ? "secondary" : "outline"}
               className="h-12 px-4 text-base"
               aria-label={t("scoreViewerFitWidth")}
+              title={t("scoreViewerFitWidth")}
               aria-pressed={fitWidth}
               onClick={fitToWidth}
             >
@@ -292,6 +295,7 @@ export function ScoreViewer({ data, fileName, onStatusChange }: ScoreViewerProps
             size="icon-lg"
             className="size-14"
             aria-label={t("scoreViewerPrevPage")}
+            title={t("scoreViewerPrevPage")}
             disabled={pageNumber <= 1}
             onClick={goToPreviousPage}
           >
@@ -305,6 +309,7 @@ export function ScoreViewer({ data, fileName, onStatusChange }: ScoreViewerProps
             size="icon-lg"
             className="size-14"
             aria-label={t("scoreViewerNextPage")}
+            title={t("scoreViewerNextPage")}
             disabled={pageNumber >= pageCount}
             onClick={goToNextPage}
           >