diff --git a/backend/package-lock.json b/backend/package-lock.json
index 44b26c8..ebe6d64 100644
--- a/backend/package-lock.json
+++ b/backend/package-lock.json
@@ -9,11 +9,14 @@
       "version": "0.0.1",
       "license": "UNLICENSED",
       "dependencies": {
+        "@nestjs/class-validator": "^0.13.4",
         "@nestjs/common": "^11.0.1",
         "@nestjs/config": "^4.0.2",
         "@nestjs/core": "^11.0.1",
         "@nestjs/platform-express": "^11.0.1",
         "@nestjs/typeorm": "^11.0.0",
+        "class-transformer": "^0.5.1",
+        "class-validator": "^0.14.1",
         "crypto": "^1.0.1",
         "pg": "^8.14.1",
         "reflect-metadata": "^0.2.2",
@@ -2087,6 +2090,15 @@
         "node": ">= 10"
       }
     },
+    "node_modules/@nestjs/class-validator": {
+      "version": "0.13.4",
+      "resolved": "https://registry.npmjs.org/@nestjs/class-validator/-/class-validator-0.13.4.tgz",
+      "integrity": "sha512-/mqZL36LJ5uV5WDhi87Cd52IssuO+SStaOr2+6sBsvCCGUWkoJes4Wwzmm3m/gdHH+tsNxX60sVSzYcU6hAy9Q==",
+      "dependencies": {
+        "libphonenumber-js": "^1.9.43",
+        "validator": "^13.7.0"
+      }
+    },
     "node_modules/@nestjs/cli": {
       "version": "11.0.5",
       "resolved": "https://registry.npmjs.org/@nestjs/cli/-/cli-11.0.5.tgz",
@@ -3076,6 +3088,11 @@
         "@types/superagent": "^8.1.0"
       }
     },
+    "node_modules/@types/validator": {
+      "version": "13.12.3",
+      "resolved": "https://registry.npmjs.org/@types/validator/-/validator-13.12.3.tgz",
+      "integrity": "sha512-2ipwZ2NydGQJImne+FhNdhgRM37e9lCev99KnqkbFHd94Xn/mErARWI1RSLem1QA19ch5kOhzIZd7e8CA2FI8g=="
+    },
     "node_modules/@types/yargs": {
       "version": "17.0.33",
       "resolved": "https://registry.npmjs.org/@types/yargs/-/yargs-17.0.33.tgz",
@@ -4412,6 +4429,21 @@
       "integrity": "sha512-9z8TZaGM1pfswYeXrUpzPrkx8UnWYdhJclsiYMm6x/w5+nN+8Tf/LnAgfLGQCm59qAOxU8WwHEq2vNwF6i4j+Q==",
       "dev": true
     },
+    "node_modules/class-transformer": {
+      "version": "0.5.1",
+      "resolved": "https://registry.npmjs.org/class-transformer/-/class-transformer-0.5.1.tgz",
+      "integrity": "sha512-SQa1Ws6hUbfC98vKGxZH3KFY0Y1lm5Zm0SY8XX9zbK7FJCyVEac3ATW0RIpwzW+oOfmHE5PMPufDG9hCfoEOMw=="
+    },
+    "node_modules/class-validator": {
+      "version": "0.14.1",
+      "resolved": "https://registry.npmjs.org/class-validator/-/class-validator-0.14.1.tgz",
+      "integrity": "sha512-2VEG9JICxIqTpoK1eMzZqaV+u/EiwEJkMGzTrZf6sU/fwsnOITVgYJ8yojSy6CaXtO9V0Cc6ZQZ8h8m4UBuLwQ==",
+      "dependencies": {
+        "@types/validator": "^13.11.8",
+        "libphonenumber-js": "^1.10.53",
+        "validator": "^13.9.0"
+      }
+    },
     "node_modules/cli-cursor": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/cli-cursor/-/cli-cursor-3.1.0.tgz",
@@ -7456,6 +7488,11 @@
         "node": ">= 0.8.0"
       }
     },
+    "node_modules/libphonenumber-js": {
+      "version": "1.12.6",
+      "resolved": "https://registry.npmjs.org/libphonenumber-js/-/libphonenumber-js-1.12.6.tgz",
+      "integrity": "sha512-PJiS4ETaUfCOFLpmtKzAbqZQjCCKVu2OhTV4SVNNE7c2nu/dACvtCqj4L0i/KWNnIgRv7yrILvBj5Lonv5Ncxw=="
+    },
     "node_modules/lines-and-columns": {
       "version": "1.2.4",
       "resolved": "https://registry.npmjs.org/lines-and-columns/-/lines-and-columns-1.2.4.tgz",
@@ -10448,6 +10485,14 @@
         "node": ">=10.12.0"
       }
     },
+    "node_modules/validator": {
+      "version": "13.15.0",
+      "resolved": "https://registry.npmjs.org/validator/-/validator-13.15.0.tgz",
+      "integrity": "sha512-36B2ryl4+oL5QxZ3AzD0t5SsMNGvTtQHpjgFO5tbNxfXbMFkY822ktCDe1MnlqV3301QQI9SLHDNJokDI+Z9pA==",
+      "engines": {
+        "node": ">= 0.10"
+      }
+    },
     "node_modules/vary": {
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
diff --git a/backend/package.json b/backend/package.json
index 79120d0..ea52f1b 100644
--- a/backend/package.json
+++ b/backend/package.json
@@ -20,11 +20,14 @@
     "test:e2e": "jest --config ./test/jest-e2e.json"
   },
   "dependencies": {
+    "@nestjs/class-validator": "^0.13.4",
     "@nestjs/common": "^11.0.1",
     "@nestjs/config": "^4.0.2",
     "@nestjs/core": "^11.0.1",
     "@nestjs/platform-express": "^11.0.1",
     "@nestjs/typeorm": "^11.0.0",
+    "class-transformer": "^0.5.1",
+    "class-validator": "^0.14.1",
     "crypto": "^1.0.1",
     "pg": "^8.14.1",
     "reflect-metadata": "^0.2.2",
diff --git a/backend/src/song/song.controller.spec.ts b/backend/src/song/song.controller.spec.ts
index da8755e..0c0c9a9 100644
--- a/backend/src/song/song.controller.spec.ts
+++ b/backend/src/song/song.controller.spec.ts
@@ -3,8 +3,10 @@ import { getRepositoryToken } from '@nestjs/typeorm';
 import { SongController } from './song.controller';
 import { SongService } from './song.service';
 import { Song } from './song.entity';
+import { Album } from '../album/album.entity';
 
 const mockSong = new Song();
+const mockAlbum = new Album();
 
 describe('SongController', () => {
   let controller: SongController;
@@ -24,6 +26,16 @@ describe('SongController', () => {
             remove: jest.fn().mockResolvedValue(null),
           },
         },
+        {
+          provide: getRepositoryToken(Album),
+          useValue: {
+            findAll: jest.fn().mockResolvedValue([mockAlbum]),
+            findOneById: jest.fn().mockResolvedValue(mockAlbum),
+            create: jest.fn().mockResolvedValue(1),
+            update: jest.fn().mockResolvedValue("Album updated successfully"),
+            remove: jest.fn().mockResolvedValue(null),
+          },
+        },
       ]
     }).compile();
 
diff --git a/backend/src/song/song.service.spec.ts b/backend/src/song/song.service.spec.ts
index b02a751..42ccfcb 100644
--- a/backend/src/song/song.service.spec.ts
+++ b/backend/src/song/song.service.spec.ts
@@ -2,8 +2,10 @@ import { Test, TestingModule } from '@nestjs/testing';
 import { getRepositoryToken } from '@nestjs/typeorm';
 import { SongService } from './song.service';
 import { Song } from './song.entity';
+import { Album } from '../album/album.entity';
 
 const mockSong = new Song();
+const mockAlbum = new Album();
 
 describe('SongService', () => {
   let service: SongService;
@@ -22,6 +24,16 @@ describe('SongService', () => {
             remove: jest.fn().mockResolvedValue(null),
           },
         },
+        {
+          provide: getRepositoryToken(Album),
+          useValue: {
+            findAll: jest.fn().mockResolvedValue([mockAlbum]),
+            findOneById: jest.fn().mockResolvedValue(mockAlbum),
+            create: jest.fn().mockResolvedValue(1),
+            update: jest.fn().mockResolvedValue("Album updated successfully"),
+            remove: jest.fn().mockResolvedValue(null),
+          },
+        },
       ]
     }).compile();