Partially implemented ArtistRefreshCommand. In order to move forward, API may need to be switched to Spotify.

src/NzbDrone.Core/Music/Commands/RefreshArtistCommand.cs

@@ -0,0 +1,26 @@
+using NzbDrone.Core.Messaging.Commands;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace NzbDrone.Core.Music.Commands
+{
+    public class RefreshArtistCommand : Command
+    {
+        public int? ArtistId { get; set; }
+
+        public RefreshArtistCommand()
+        {
+        }
+
+        public RefreshArtistCommand(int? artistId)
+        {
+            ArtistId = artistId;
+        }
+
+        public override bool SendUpdatesToClient => true;
+
+        public override bool UpdateScheduledTask => !ArtistId.HasValue;
+    }
+}