diff --git a/apps/web/src/features/tracks/components/TrackSearch.tsx b/apps/web/src/features/tracks/components/TrackSearch.tsx
index dc039c280..d1e6ce40b 100644
--- a/apps/web/src/features/tracks/components/TrackSearch.tsx
+++ b/apps/web/src/features/tracks/components/TrackSearch.tsx
@@ -80,6 +80,7 @@ export function TrackSearch({
   }, [
     debouncedQuery,
     filters.genre,
+    filters.musicalKey,
     filters.format,
     filters.tags,
     filters.minDuration,
diff --git a/apps/web/src/features/tracks/components/track-search-filters/TrackSearchFiltersBasic.tsx b/apps/web/src/features/tracks/components/track-search-filters/TrackSearchFiltersBasic.tsx
index a491d021e..04e04487e 100644
--- a/apps/web/src/features/tracks/components/track-search-filters/TrackSearchFiltersBasic.tsx
+++ b/apps/web/src/features/tracks/components/track-search-filters/TrackSearchFiltersBasic.tsx
@@ -5,6 +5,7 @@ import { Button } from '@/components/ui/button';
 import { X } from 'lucide-react';
 import {
   GENRES,
+  MUSICAL_KEYS,
   FORMATS,
   SORT_OPTIONS,
   SORT_ORDER_OPTIONS,
@@ -44,6 +45,21 @@ export function TrackSearchFiltersBasic({
           className={selectClass}
         />
       </div>
+      <div className="flex-1 min-w-48">
+        <Label htmlFor="musicalKey" className={labelClass}>
+          Tonalité
+        </Label>
+        <Select
+          options={MUSICAL_KEYS}
+          value={filters.musicalKey || ''}
+          onChange={(value) => {
+            const musicalKey = Array.isArray(value) ? value[0] : value;
+            updateFilter('musicalKey', musicalKey || undefined);
+          }}
+          placeholder="Toutes les tonalités"
+          className={selectClass}
+        />
+      </div>
       <div className="flex-1 min-w-48">
         <Label htmlFor="format" className={labelClass}>
           Format
diff --git a/apps/web/src/features/tracks/components/track-search-filters/types.ts b/apps/web/src/features/tracks/components/track-search-filters/types.ts
index be80def32..4ff29aa68 100644
--- a/apps/web/src/features/tracks/components/track-search-filters/types.ts
+++ b/apps/web/src/features/tracks/components/track-search-filters/types.ts
@@ -23,6 +23,24 @@ export const GENRES: SelectOption[] = [
   { value: 'Metal', label: 'Metal' },
 ];
 
+export const MUSICAL_KEYS: SelectOption[] = [
+  { value: '', label: 'Toutes les tonalités' },
+  { value: 'C', label: 'C' },
+  { value: 'Cm', label: 'Cm' },
+  { value: 'D', label: 'D' },
+  { value: 'Dm', label: 'Dm' },
+  { value: 'E', label: 'E' },
+  { value: 'Em', label: 'Em' },
+  { value: 'F', label: 'F' },
+  { value: 'Fm', label: 'Fm' },
+  { value: 'G', label: 'G' },
+  { value: 'Gm', label: 'Gm' },
+  { value: 'A', label: 'A' },
+  { value: 'Am', label: 'Am' },
+  { value: 'B', label: 'B' },
+  { value: 'Bm', label: 'Bm' },
+];
+
 export const FORMATS: SelectOption[] = [
   { value: '', label: 'Tous les formats' },
   { value: 'MP3', label: 'MP3' },
diff --git a/apps/web/src/features/tracks/components/track-search-filters/useTrackSearchFilters.ts b/apps/web/src/features/tracks/components/track-search-filters/useTrackSearchFilters.ts
index 53b822476..a931ee6f0 100644
--- a/apps/web/src/features/tracks/components/track-search-filters/useTrackSearchFilters.ts
+++ b/apps/web/src/features/tracks/components/track-search-filters/useTrackSearchFilters.ts
@@ -37,6 +37,7 @@ export function useTrackSearchFilters(
 
   const hasActiveFilters = Boolean(
     filters.genre ||
+      filters.musicalKey ||
       filters.format ||
       filters.tags?.length ||
       filters.minDuration ||
diff --git a/apps/web/src/features/tracks/services/trackSearchService.ts b/apps/web/src/features/tracks/services/trackSearchService.ts
index 30eec2f2b..47cda7b8e 100644
--- a/apps/web/src/features/tracks/services/trackSearchService.ts
+++ b/apps/web/src/features/tracks/services/trackSearchService.ts
@@ -29,6 +29,7 @@ export interface TrackSearchParams {
   query?: string;
   tags?: string[];
   tagMode?: 'AND' | 'OR';
+  musicalKey?: string;
   minDuration?: number;
   maxDuration?: number;
   minBPM?: number;
@@ -86,6 +87,10 @@ function buildSearchQuery(params: TrackSearchParams): URLSearchParams {
     queryParams.append('tag_mode', params.tagMode);
   }
 
+  if (params.musicalKey) {
+    queryParams.append('musical_key', params.musicalKey);
+  }
+
   if (params.minDuration !== undefined) {
     queryParams.append('min_duration', params.minDuration.toString());
   }
diff --git a/veza-backend-api/internal/core/track/handler.go b/veza-backend-api/internal/core/track/handler.go
index d3b56da26..a0b7dfc25 100644
--- a/veza-backend-api/internal/core/track/handler.go
+++ b/veza-backend-api/internal/core/track/handler.go
@@ -1613,6 +1613,11 @@ func (h *TrackHandler) SearchTracks(c *gin.Context) {
 		params.Format = &format
 	}
 
+	// Parser musical_key
+	if musicalKey := c.Query("musical_key"); musicalKey != "" {
+		params.MusicalKey = &musicalKey
+	}
+
 	// Parser min_date
 	if minDate := c.Query("min_date"); minDate != "" {
 		params.MinDate = &minDate
diff --git a/veza-backend-api/internal/services/track_search_service.go b/veza-backend-api/internal/services/track_search_service.go
index 956faeae4..703c1daab 100644
--- a/veza-backend-api/internal/services/track_search_service.go
+++ b/veza-backend-api/internal/services/track_search_service.go
@@ -6,6 +6,7 @@ import (
 	"strings"
 	"time"
 
+	"github.com/lib/pq"
 	"veza-backend-api/internal/database"
 	"veza-backend-api/internal/models"
 
@@ -17,6 +18,7 @@ type TrackSearchParams struct {
 	Query       string
 	Tags        []string
 	TagMode     string // "AND" or "OR"
+	MusicalKey  *string
 	MinDuration *int   // seconds
 	MaxDuration *int   // seconds
 	MinBPM      *int
@@ -59,11 +61,19 @@ func (s *TrackSearchService) SearchTracks(ctx context.Context, params TrackSearc
 		)
 	}
 
-	// Tag search - Note: Tags field not in current model, skipping for now
-	// This can be implemented when tags are added to the Track model
+	// Tag search (tracks.tags pq.StringArray, migration 085)
 	if len(params.Tags) > 0 {
-		// Tags functionality would go here when Tags field is added
-		// For now, we'll skip tag filtering
+		tagArray := pq.Array(params.Tags)
+		if params.TagMode == "AND" {
+			query = query.Where("tags @> ?", tagArray)
+		} else {
+			query = query.Where("tags && ?", tagArray)
+		}
+	}
+
+	// Musical key filter (case-insensitive)
+	if params.MusicalKey != nil && *params.MusicalKey != "" {
+		query = query.Where("LOWER(musical_key) = ?", strings.ToLower(strings.TrimSpace(*params.MusicalKey)))
 	}
 
 	// Duration filter (supports combined min/max)