diff --git a/Edge.MyMusic/src/Edge.MyMusic.Tests/MusicServiceTests.cs b/Edge.MyMusic/src/Edge.MyMusic.Tests/MusicServiceTests.cs
index cde1deb..9879ec1 100644
--- a/Edge.MyMusic/src/Edge.MyMusic.Tests/MusicServiceTests.cs
+++ b/Edge.MyMusic/src/Edge.MyMusic.Tests/MusicServiceTests.cs
@@ -229,7 +229,7 @@ public async Task CanUpdateFavoriteSongAsync()
     }
 
 
-    internal void AssertEqual(MusicDocument expected, SongResponse actual)
+    private static void AssertEqual(MusicDocument expected, SongResponse actual)
     {
         Assert.Equal(expected.Id, actual.Id);
         Assert.Equal(expected.Album, actual.Album);
diff --git a/Edge.MyMusic/src/Edge.MyMusic.Tests/StartupProcessorTests.cs b/Edge.MyMusic/src/Edge.MyMusic.Tests/StartupProcessorTests.cs
new file mode 100644
index 0000000..f3b8810
--- /dev/null
+++ b/Edge.MyMusic/src/Edge.MyMusic.Tests/StartupProcessorTests.cs
@@ -0,0 +1,61 @@
+using Edge.MyMusic.Processors;
+using Edge.MyMusic.Providers;
+using Edge.MyMusic.Repositories;
+using Edge.MyMusic.Settings;
+using Microsoft.Extensions.Logging;
+
+namespace Edge.MyMusic.Tests;
+
+public class StartupProcessorTests
+{
+    private readonly Mock<ILogger<StartupProcessor>> _logger;
+    private readonly Mock<IMusicRepository> _repo;
+    private readonly Mock<IAudioProvider> _audioProvider;
+    private readonly Mock<IArgsSetting> _setting;
+
+    private readonly StartupProcessor _processor;
+
+    public StartupProcessorTests()
+    {
+        _logger = new Mock<ILogger<StartupProcessor>>();
+        _repo = new Mock<IMusicRepository>();
+        _audioProvider = new Mock<IAudioProvider>();
+        _setting = new Mock<IArgsSetting>();
+
+        _processor = new StartupProcessor(_logger.Object, _repo.Object, _audioProvider.Object, _setting.Object);
+    }
+
+    [Fact]
+    public async Task CanStartAsync()
+    {
+        // ACT
+        await _processor.StartAsync(default);
+
+        // ASSERT
+        _logger.Verify(
+            log => log.Log(
+                It.Is<LogLevel>(l => l == LogLevel.Information),
+                It.IsAny<EventId>(),
+                It.Is<It.IsAnyType>((v, t) => v.ToString() == $"{nameof(StartupProcessor)} is starting..."),
+                It.IsAny<Exception>(),
+                It.Is<Func<It.IsAnyType, Exception?, string>>((v, t) => true)),
+        Times.Once);
+    }
+
+    [Fact]
+    public async Task CanStopAsync()
+    {
+        // ACT
+        await _processor.StopAsync(default);
+
+        // ASSERT
+        _logger.Verify(
+            log => log.Log(
+                It.Is<LogLevel>(l => l == LogLevel.Information),
+                It.IsAny<EventId>(),
+                It.Is<It.IsAnyType>((v, t) => v.ToString() == $"{nameof(StartupProcessor)} is stopping..."),
+                It.IsAny<Exception>(),
+                It.Is<Func<It.IsAnyType, Exception?, string>>((v, t) => true)),
+        Times.Once);
+    }
+}
\ No newline at end of file
diff --git a/Edge.MyMusic/src/Edge.MyMusic/ApplicationBuilderExtension.cs b/Edge.MyMusic/src/Edge.MyMusic/ApplicationBuilderExtension.cs
index a27ff7e..43073e1 100644
--- a/Edge.MyMusic/src/Edge.MyMusic/ApplicationBuilderExtension.cs
+++ b/Edge.MyMusic/src/Edge.MyMusic/ApplicationBuilderExtension.cs
@@ -57,6 +57,11 @@ internal static IApplicationBuilder UseCors(this IApplicationBuilder application
 
     internal static IApplicationBuilder UseServerHandler(this IApplicationBuilder application)
     {
+        JsonSerializerOptions options = new()
+        {
+            PropertyNamingPolicy = JsonNamingPolicy.CamelCase
+        };
+
         return application.UseExceptionHandler(app => 
         {
             app.Run(async context =>
@@ -77,10 +82,7 @@ await context.Response.WriteAsync(JsonSerializer.Serialize
                                 Type = exceptionHandlerPathFeature.Error.GetType().Name,
                                 exceptionHandlerPathFeature.Error.Message
                             },
-                            new JsonSerializerOptions()
-                            {
-                                PropertyNamingPolicy = JsonNamingPolicy.CamelCase
-                            }
+                            options
                         ));
                     }
                 }
diff --git a/Edge.MyMusic/src/Edge.MyMusic/Controllers/Models/SongPostRequest.cs b/Edge.MyMusic/src/Edge.MyMusic/Controllers/Models/SongPostRequest.cs
index 7a55170..d7256e7 100644
--- a/Edge.MyMusic/src/Edge.MyMusic/Controllers/Models/SongPostRequest.cs
+++ b/Edge.MyMusic/src/Edge.MyMusic/Controllers/Models/SongPostRequest.cs
@@ -24,7 +24,7 @@ public IEnumerable<ValidationResult> Validate(ValidationContext validationContex
         });
     }
 
-    internal IEnumerable<ValidationResult> Validate(IReadOnlyDictionary<string, string> properties)
+    private IEnumerable<ValidationResult> Validate(IReadOnlyDictionary<string, string> properties)
     {
         if (!Uri.IsWellFormedUriString(this.Path, UriKind.Absolute))
         {
diff --git a/Edge.MyMusic/src/Edge.MyMusic/Controllers/Models/SongPutRequest.cs b/Edge.MyMusic/src/Edge.MyMusic/Controllers/Models/SongPutRequest.cs
index b23fb44..ae07397 100644
--- a/Edge.MyMusic/src/Edge.MyMusic/Controllers/Models/SongPutRequest.cs
+++ b/Edge.MyMusic/src/Edge.MyMusic/Controllers/Models/SongPutRequest.cs
@@ -25,7 +25,7 @@ public IEnumerable<ValidationResult> Validate(ValidationContext validationContex
         });
     }
 
-    internal IEnumerable<ValidationResult> Validate(IReadOnlyDictionary<string, string?> properties)
+    private IEnumerable<ValidationResult> Validate(IReadOnlyDictionary<string, string?> properties)
     {
 
         if (!string.IsNullOrEmpty(this.Path) && !Uri.IsWellFormedUriString(this.Path, UriKind.Absolute))
diff --git a/Edge.MyMusic/src/Edge.MyMusic/Processors/BaseProcessor.cs b/Edge.MyMusic/src/Edge.MyMusic/Processors/BaseProcessor.cs
index 99588b8..fa69815 100644
--- a/Edge.MyMusic/src/Edge.MyMusic/Processors/BaseProcessor.cs
+++ b/Edge.MyMusic/src/Edge.MyMusic/Processors/BaseProcessor.cs
@@ -1,6 +1,6 @@
 namespace Edge.MyMusic.Processors;
 
-internal abstract class BaseProcessor: IHostedLifecycleService
+public abstract class BaseProcessor: IHostedLifecycleService
 {
     public virtual Task StartingAsync(CancellationToken cancellationToken) => Task.CompletedTask;
     public virtual Task StartAsync(CancellationToken cancellationToken) => Task.CompletedTask;
diff --git a/Edge.MyMusic/src/Edge.MyMusic/Processors/StartupProcessor.cs b/Edge.MyMusic/src/Edge.MyMusic/Processors/StartupProcessor.cs
index 8277cf0..8f8b5a4 100644
--- a/Edge.MyMusic/src/Edge.MyMusic/Processors/StartupProcessor.cs
+++ b/Edge.MyMusic/src/Edge.MyMusic/Processors/StartupProcessor.cs
@@ -6,13 +6,13 @@
 
 namespace Edge.MyMusic.Processors;
 
-internal class StartupProcessor(
+public class StartupProcessor(
     ILogger<StartupProcessor> logger,
     IMusicRepository musicRepository,
     IAudioProvider audioProvider,
     IArgsSetting argsSetting) : BaseProcessor
 {
-    private readonly ILogger _logger = logger;
+    private readonly ILogger<StartupProcessor> _logger = logger;
     private readonly IMusicRepository _musicRepository = musicRepository;
     private readonly IAudioProvider _audioProvider = audioProvider;
     private readonly IArgsSetting _argsSetting = argsSetting;
@@ -32,19 +32,22 @@ public override Task StartedAsync(CancellationToken cancellationToken)
             return Task.CompletedTask;
         }
 
-        return Task.Run(async() => 
+        try
         {
-            IEnumerable<string> files = Directory.EnumerateFiles(_argsSetting.AudiosPath);
-
-            foreach(string filePath in files)
+            return Parallel.ForEachAsync(
+                Directory.EnumerateFiles(_argsSetting.AudiosPath), 
+                new ParallelOptions { MaxDegreeOfParallelism = 3, 
+                CancellationToken = cancellationToken }, async (file, ct) => 
             {
-                string path = $"{_argsSetting.BaseUrl}/audios/{Path.GetFileName(filePath)}";
+                ct.ThrowIfCancellationRequested();
+
+                string path = $"{_argsSetting.BaseUrl}/audios/{Path.GetFileName(file)}";
                 AudioResponse? audio =  await _audioProvider.GetMetadataAsync(path);
 
                 if (audio == null)
                 {
-                    _logger.LogWarning($"Unable to find audio file {path}", new[] { path});
-                    continue;
+                    _logger.LogWarning($"Unable to find audio file", new[] { path });
+                    return;
                 }
 
                 await _musicRepository.AddMusicAsync(new MusicDocument
@@ -56,8 +59,13 @@ await _musicRepository.AddMusicAsync(new MusicDocument
                     Path = path,
                     Title = audio.Title ?? _default  
                 });
-            };
-        });
+            });
+        }
+        catch(OperationCanceledException ex)
+        {
+            _logger.LogWarning("Operation was cancelled", new[] { ex.Message });
+            return Task.CompletedTask;
+        }
     }
 
     public override Task StopAsync(CancellationToken cancellationToken)
diff --git a/Edge.MyMusic/src/Edge.MyMusic/Services/MapperExtension.cs b/Edge.MyMusic/src/Edge.MyMusic/Services/MapperExtension.cs
index 88e03a6..a127b4c 100644
--- a/Edge.MyMusic/src/Edge.MyMusic/Services/MapperExtension.cs
+++ b/Edge.MyMusic/src/Edge.MyMusic/Services/MapperExtension.cs
@@ -13,7 +13,7 @@ public static MusicDocument ToDocument(this SongPostRequest from, int? duration)
             Album = from.Album,
             Artist = from.Artist,
             IsFavorite = from.IsFavorite,
-            Length = duration ?? 0,
+            Length = duration.GetValueOrDefault(-1),
             Path = from.Path,
             Title = from.Title
         };
diff --git a/Edge.MyMusic/src/Edge.MyMusic/Services/MusicService.cs b/Edge.MyMusic/src/Edge.MyMusic/Services/MusicService.cs
index 0782244..9f285ab 100644
--- a/Edge.MyMusic/src/Edge.MyMusic/Services/MusicService.cs
+++ b/Edge.MyMusic/src/Edge.MyMusic/Services/MusicService.cs
@@ -17,14 +17,7 @@ public async Task<CollectionModel<SongResponse>> SearchSongsAsync(SongSearchRequ
 
     public async Task<SongResponse> AddSongAsync(SongPostRequest request)
     {
-        try
-        {
-            return (await _musicRepository.AddMusicAsync(request.ToDocument((await _audioProvider.GetMetadataAsync(request.Path))?.Duration))).ToResponse();
-        }
-        catch
-        {
-            throw new Exception("Unable to add song");
-        }
+        return (await _musicRepository.AddMusicAsync(request.ToDocument((await _audioProvider.GetMetadataAsync(request.Path))?.Duration))).ToResponse();
     }
 
     public async Task<SongResponse?> GetSongAsync(string id)
diff --git a/Edge.MyMusic/src/Edge.MyMusic/Settings/ApplicationSetting.cs b/Edge.MyMusic/src/Edge.MyMusic/Settings/ApplicationSetting.cs
index 4e702cb..ae4f18c 100644
--- a/Edge.MyMusic/src/Edge.MyMusic/Settings/ApplicationSetting.cs
+++ b/Edge.MyMusic/src/Edge.MyMusic/Settings/ApplicationSetting.cs
@@ -1,6 +1,6 @@
 namespace Edge.MyMusic.Settings;
 
-internal class ApplicationSetting : ICORSPolicySetting, IArgsSetting, IMongoDBSetting
+internal class ApplicationSetting : IApplicationSetting
 {
     public string? PolicyName { get; init; }
     public string[]? AllowedOrigins { get; init; }
diff --git a/Edge.MyMusic/src/Edge.MyMusic/Settings/IApplicationSetting.cs b/Edge.MyMusic/src/Edge.MyMusic/Settings/IApplicationSetting.cs
new file mode 100644
index 0000000..98a5ab8
--- /dev/null
+++ b/Edge.MyMusic/src/Edge.MyMusic/Settings/IApplicationSetting.cs
@@ -0,0 +1,3 @@
+namespace Edge.MyMusic.Settings;
+
+public interface IApplicationSetting : ICORSPolicySetting, IArgsSetting, IMongoDBSetting;
\ No newline at end of file
diff --git a/Edge.MyMusic/src/Edge.MyMusic/Settings/IArgsSetting.cs b/Edge.MyMusic/src/Edge.MyMusic/Settings/IArgsSetting.cs
index b1e1266..4ac085c 100644
--- a/Edge.MyMusic/src/Edge.MyMusic/Settings/IArgsSetting.cs
+++ b/Edge.MyMusic/src/Edge.MyMusic/Settings/IArgsSetting.cs
@@ -1,6 +1,6 @@
 namespace Edge.MyMusic.Settings;
 
-internal interface IArgsSetting
+public interface IArgsSetting
 {
     string? AudiosPath { get; init; }
     string? BaseUrl { get; init; }
diff --git a/Edge.MyMusic/src/Edge.MyMusic/Settings/ICORSPolicySetting.cs b/Edge.MyMusic/src/Edge.MyMusic/Settings/ICORSPolicySetting.cs
index b0869e2..d7e8050 100644
--- a/Edge.MyMusic/src/Edge.MyMusic/Settings/ICORSPolicySetting.cs
+++ b/Edge.MyMusic/src/Edge.MyMusic/Settings/ICORSPolicySetting.cs
@@ -1,6 +1,6 @@
 namespace Edge.MyMusic.Settings;
 
-internal interface ICORSPolicySetting
+public interface ICORSPolicySetting
 {
     string? PolicyName { get; init; }
     string[]? AllowedOrigins { get; init; }
diff --git a/Edge.MyMusic/src/Edge.MyMusic/Settings/IMongoDBSetting.cs b/Edge.MyMusic/src/Edge.MyMusic/Settings/IMongoDBSetting.cs
index 7412488..b2070dd 100644
--- a/Edge.MyMusic/src/Edge.MyMusic/Settings/IMongoDBSetting.cs
+++ b/Edge.MyMusic/src/Edge.MyMusic/Settings/IMongoDBSetting.cs
@@ -1,6 +1,6 @@
 namespace Edge.MyMusic.Settings;
 
-internal interface IMongoDBSetting
+public interface IMongoDBSetting
 {
     string? ConnectionString { get; init; }
     string? DatabaseName { get; init; }
diff --git a/Web.MyMusic/src/shared/components/nav-sidebar.tsx b/Web.MyMusic/src/shared/components/nav-sidebar.tsx
index c1ef200..c49aa68 100644
--- a/Web.MyMusic/src/shared/components/nav-sidebar.tsx
+++ b/Web.MyMusic/src/shared/components/nav-sidebar.tsx
@@ -21,7 +21,7 @@ const StyledListItemButton = styled(ListItemButton)({
         backgroundColor: Color.NeonPink,
         color: "white",
         "& .MuiSvgIcon-root": {
-            color: Color.White, // Change the color of the icon on hover
+            color: Color.White,
         },
     },
 });