improve theme song methods

MediaBrowser.Model/MediaBrowser.Model.csproj

@@ -84,6 +84,7 @@
     <Compile Include="Net\NetworkShare.cs" />
     <Compile Include="Net\NetworkShareType.cs" />
     <Compile Include="Querying\PersonsQuery.cs" />
+    <Compile Include="Querying\ThemeSongsResult.cs" />
     <Compile Include="Serialization\IJsonSerializer.cs" />
     <Compile Include="Serialization\IXmlSerializer.cs" />
     <Compile Include="Updates\CheckForUpdateResult.cs" />

MediaBrowser.Model/Querying/ThemeSongsResult.cs

@@ -0,0 +1,16 @@
+using System;
+
+namespace MediaBrowser.Model.Querying
+{
+    /// <summary>
+    /// Class ThemeSongsResult
+    /// </summary>
+    public class ThemeSongsResult : ItemsResult
+    {
+        /// <summary>
+        /// Gets or sets the owner id.
+        /// </summary>
+        /// <value>The owner id.</value>
+        public string OwnerId { get; set; }
+    }
+}