Добавьте файлы проекта.

YandexMusic.API/Models/Pins/Items/YPin.cs

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+namespace YandexMusic.API.Models.Pins.Items
+{
+    public sealed class YPinConverter : JsonConverter
+    {
+        private YPin GetEvent(JToken jObject)
+        {
+            YPin pin;
+
+            YPinType type = jObject["type"]
+                .ToObject<YPinType>();
+
+            switch (type)
+            {
+                case YPinType.Album:
+                    pin = jObject.ToObject<YPin<YPinAlbumData>>();
+                    break;
+
+                case YPinType.Artist:
+                    pin = jObject.ToObject<YPin<YPinArtistData>>();
+                    break;
+
+                case YPinType.Playlist:
+                    pin = jObject.ToObject<YPin<YPinPlaylistData>>();
+                    break;
+
+                case YPinType.Wave:
+                    pin = jObject.ToObject<YPin<YPinWaveData>>();
+                    break;
+
+                default:
+                    pin = jObject.ToObject<YPin>();
+                    break;
+            }
+
+            return pin;
+        }
+
+        public override bool CanConvert(Type objectType)
+        {
+            return typeof(YPin).IsAssignableFrom(objectType);
+        }
+
+        public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
+        {
+            if (reader.TokenType == JsonToken.Null)
+                return null;
+
+            return JArray.Load(reader)
+                .Select(GetEvent)
+                .ToList();
+        }
+
+        public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
+        {
+            throw new NotImplementedException();
+        }
+    }
+
+    public abstract class YPin
+    {
+        public YPinType Type { get; set; }
+    }
+
+    public class YPin<T> : YPin
+    {
+        public T Data { get; set; }
+    }
+}

YandexMusic.API/Models/Pins/Items/YPinAlbumData.cs

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+namespace YandexMusic.API.Models.Pins.Items
+{
+    public class YPinAlbumData
+    {
+
+    }
+}

YandexMusic.API/Models/Pins/Items/YPinArtistData.cs

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+namespace YandexMusic.API.Models.Pins.Items
+{
+    public class YPinArtistData
+    {
+
+    }
+}

YandexMusic.API/Models/Pins/Items/YPinPlaylistData.cs

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+namespace YandexMusic.API.Models.Pins.Items
+{
+    public class YPinPlaylistData
+    {
+
+    }
+}

YandexMusic.API/Models/Pins/Items/YPinWaveData.cs

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+namespace YandexMusic.API.Models.Pins.Items
+{
+    public class YPinWaveData
+    {
+
+    }
+}

YandexMusic.API/Models/Pins/YPinType.cs

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+using System.Runtime.Serialization;
+
+namespace YandexMusic.API.Models.Pins
+{
+    public enum YPinType
+    {
+        [EnumMember(Value = "album_item")]
+        Album,
+
+        [EnumMember(Value = "artist_item")]
+        Artist,
+
+        [EnumMember(Value = "playlist_item")]
+        Playlist,
+
+        [EnumMember(Value = "wave_item")]
+        Wave
+    }
+}

YandexMusic.API/Models/Pins/YPins.cs

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+using YandexMusic.API.Models.Pins.Items;
+
+namespace YandexMusic.API.Models.Pins
+{
+    public class YPins
+    {
+        [JsonConverter(typeof(YPinConverter))]
+        public List<YPin> Pins { get; set; }
+    }
+}