7 files changed, 50 insertions, 72 deletions
diff --git a/MediaBrowser.Controller/Entities/Audio/Audio.cs b/MediaBrowser.Controller/Entities/Audio/Audio.cs
index 13a6fe44a..67b21068a 100644
--- a/MediaBrowser.Controller/Entities/Audio/Audio.cs
+++ b/MediaBrowser.Controller/Entities/Audio/Audio.cs
@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Linq;
 using MediaBrowser.Controller.Persistence;
 using MediaBrowser.Controller.Providers;
 using MediaBrowser.Model.Configuration;
@@ -19,15 +20,13 @@ namespace MediaBrowser.Controller.Entities.Audio
         IHasLookupInfo<SongInfo>,
         IHasMediaSources
     {
-        /// <summary>
-        /// Gets or sets the artist.
-        /// </summary>
-        /// <value>The artist.</value>
+        /// <inheritdoc />
         [IgnoreDataMember]
-        public string[] Artists { get; set; }
+        public IReadOnlyList<string> Artists { get; set; }
 
+        /// <inheritdoc />
         [IgnoreDataMember]
-        public string[] AlbumArtists { get; set; }
+        public IReadOnlyList<string> AlbumArtists { get; set; }
 
         public Audio()
         {
@@ -64,30 +63,6 @@ namespace MediaBrowser.Controller.Entities.Audio
         }
 
         [IgnoreDataMember]
-        public string[] AllArtists
-        {
-            get
-            {
-                var list = new string[AlbumArtists.Length + Artists.Length];
-
-                var index = 0;
-                foreach (var artist in AlbumArtists)
-                {
-                    list[index] = artist;
-                    index++;
-                }
-                foreach (var artist in Artists)
-                {
-                    list[index] = artist;
-                    index++;
-                }
-
-                return list;
-
-            }
-        }
-
-        [IgnoreDataMember]
         public MusicAlbum AlbumEntity => FindParent<MusicAlbum>();
 
         /// <summary>
@@ -125,7 +100,7 @@ namespace MediaBrowser.Controller.Entities.Audio
                 songKey = Album + "-" + songKey;
             }
 
-            var albumArtist = AlbumArtists.Length == 0 ? null : AlbumArtists[0];
+            var albumArtist = AlbumArtists.FirstOrDefault();
             if (!string.IsNullOrEmpty(albumArtist))
             {
                 songKey = albumArtist + "-" + songKey;
diff --git a/MediaBrowser.Controller/Entities/Audio/IHasAlbumArtist.cs b/MediaBrowser.Controller/Entities/Audio/IHasAlbumArtist.cs
index a269b3486..056f31f78 100644
--- a/MediaBrowser.Controller/Entities/Audio/IHasAlbumArtist.cs
+++ b/MediaBrowser.Controller/Entities/Audio/IHasAlbumArtist.cs
@@ -1,14 +1,35 @@
+using System.Collections.Generic;
+
 namespace MediaBrowser.Controller.Entities.Audio
 {
     public interface IHasAlbumArtist
     {
-        string[] AlbumArtists { get; set; }
+        IReadOnlyList<string> AlbumArtists { get; set; }
     }
 
     public interface IHasArtist
     {
-        string[] AllArtists { get; }
+        /// <summary>
+        /// Gets or sets the artists.
+        /// </summary>
+        /// <value>The artists.</value>
+        IReadOnlyList<string> Artists { get; set; }
+    }
+
+    public static class Extentions
+    {
+        public static IEnumerable<string> GetAllArtists<T>(this T item)
+            where T : IHasArtist, IHasAlbumArtist
+        {
+            foreach (var i in item.AlbumArtists)
+            {
+                yield return i;
+            }
 
-        string[] Artists { get; set; }
+            foreach (var i in item.Artists)
+            {
+                yield return i;
+            }
+        }
     }
 }
diff --git a/MediaBrowser.Controller/Entities/Audio/MusicAlbum.cs b/MediaBrowser.Controller/Entities/Audio/MusicAlbum.cs
index 5b2939b75..edf6ffa21 100644
--- a/MediaBrowser.Controller/Entities/Audio/MusicAlbum.cs
+++ b/MediaBrowser.Controller/Entities/Audio/MusicAlbum.cs
@@ -18,8 +18,11 @@ namespace MediaBrowser.Controller.Entities.Audio
     /// </summary>
     public class MusicAlbum : Folder, IHasAlbumArtist, IHasArtist, IHasMusicGenres, IHasLookupInfo<AlbumInfo>, IMetadataContainer
     {
-        public string[] AlbumArtists { get; set; }
-        public string[] Artists { get; set; }
+        /// <inheritdoc />
+        public IReadOnlyList<string> AlbumArtists { get; set; }
+
+        /// <inheritdoc />
+        public IReadOnlyList<string> Artists { get; set; }
 
         public MusicAlbum()
         {
@@ -41,8 +44,7 @@ namespace MediaBrowser.Controller.Entities.Audio
             var parents = GetParents();
             foreach (var parent in parents)
             {
-                var artist = parent as MusicArtist;
-                if (artist != null)
+                if (parent is MusicArtist artist)
                 {
                     return artist;
                 }
@@ -63,30 +65,7 @@ namespace MediaBrowser.Controller.Entities.Audio
         public override bool SupportsCumulativeRunTimeTicks => true;
 
         [IgnoreDataMember]
-        public string[] AllArtists
-        {
-            get
-            {
-                var list = new string[AlbumArtists.Length + Artists.Length];
-
-                var index = 0;
-                foreach (var artist in AlbumArtists)
-                {
-                    list[index] = artist;
-                    index++;
-                }
-                foreach (var artist in Artists)
-                {
-                    list[index] = artist;
-                    index++;
-                }
-
-                return list;
-            }
-        }
-
-        [IgnoreDataMember]
-        public string AlbumArtist => AlbumArtists.Length == 0 ? null : AlbumArtists[0];
+        public string AlbumArtist => AlbumArtists.FirstOrDefault();
 
         [IgnoreDataMember]
         public override bool SupportsPeople => false;
@@ -216,8 +195,7 @@ namespace MediaBrowser.Controller.Entities.Audio
 
         private async Task RefreshArtists(MetadataRefreshOptions refreshOptions, CancellationToken cancellationToken)
         {
-            var all = AllArtists;
-            foreach (var i in all)
+            foreach (var i in this.GetAllArtists())
             {
                 // This should not be necessary but we're seeing some cases of it
                 if (string.IsNullOrEmpty(i))
diff --git a/MediaBrowser.Controller/Entities/MusicVideo.cs b/MediaBrowser.Controller/Entities/MusicVideo.cs
index 5bf082b7e..94fe11e9d 100644
--- a/MediaBrowser.Controller/Entities/MusicVideo.cs
+++ b/MediaBrowser.Controller/Entities/MusicVideo.cs
@@ -1,4 +1,5 @@
 using System;
+using System.Collections.Generic;
 using MediaBrowser.Controller.Entities.Audio;
 using MediaBrowser.Controller.Providers;
 using MediaBrowser.Model.Configuration;
@@ -8,17 +9,15 @@ namespace MediaBrowser.Controller.Entities
 {
     public class MusicVideo : Video, IHasArtist, IHasMusicGenres, IHasLookupInfo<MusicVideoInfo>
     {
+        /// <inheritdoc />
         [IgnoreDataMember]
-        public string[] Artists { get; set; }
+        public IReadOnlyList<string> Artists { get; set; }
 
         public MusicVideo()
         {
             Artists = Array.Empty<string>();
         }
 
-        [IgnoreDataMember]
-        public string[] AllArtists => Artists;
-
         public override UnratedItem GetBlockUnratedType()
         {
             return UnratedItem.Music;
diff --git a/MediaBrowser.Controller/Providers/AlbumInfo.cs b/MediaBrowser.Controller/Providers/AlbumInfo.cs
index b0b443fc0..ac6b86c1d 100644
--- a/MediaBrowser.Controller/Providers/AlbumInfo.cs
+++ b/MediaBrowser.Controller/Providers/AlbumInfo.cs
@@ -9,7 +9,7 @@ namespace MediaBrowser.Controller.Providers
         /// Gets or sets the album artist.
         /// </summary>
         /// <value>The album artist.</value>
-        public string[] AlbumArtists { get; set; }
+        public IReadOnlyList<string> AlbumArtists { get; set; }
 
         /// <summary>
         /// Gets or sets the artist provider ids.
diff --git a/MediaBrowser.Controller/Providers/MusicVideoInfo.cs b/MediaBrowser.Controller/Providers/MusicVideoInfo.cs
index 194b26484..9835351fc 100644
--- a/MediaBrowser.Controller/Providers/MusicVideoInfo.cs
+++ b/MediaBrowser.Controller/Providers/MusicVideoInfo.cs
@@ -1,7 +1,9 @@
+using System.Collections.Generic;
+
 namespace MediaBrowser.Controller.Providers
 {
     public class MusicVideoInfo : ItemLookupInfo
     {
-        public string[] Artists { get; set; }
+        public IReadOnlyList<string> Artists { get; set; }
     }
 }
diff --git a/MediaBrowser.Controller/Providers/SongInfo.cs b/MediaBrowser.Controller/Providers/SongInfo.cs
index 61e950130..50615b0bd 100644
--- a/MediaBrowser.Controller/Providers/SongInfo.cs
+++ b/MediaBrowser.Controller/Providers/SongInfo.cs
@@ -1,12 +1,15 @@
 using System;
+using System.Collections.Generic;
 
 namespace MediaBrowser.Controller.Providers
 {
     public class SongInfo : ItemLookupInfo
     {
-        public string[] AlbumArtists { get; set; }
+        public IReadOnlyList<string> AlbumArtists { get; set; }
+
         public string Album { get; set; }
-        public string[] Artists { get; set; }
+
+        public IReadOnlyList<string> Artists { get; set; }
 
         public SongInfo()
         {