diff --git a/streamrip/bases.py b/streamrip/bases.py
index 89f3c8a..fd402d0 100644
--- a/streamrip/bases.py
+++ b/streamrip/bases.py
@@ -656,6 +656,14 @@ class Video:
 
         return False  # so that it is not tagged
 
+    def tag(self, *args, **kwargs):
+        """Dummy method.
+
+        :param args:
+        :param kwargs:
+        """
+        return False
+
     @classmethod
     def from_album_meta(cls, track: dict, client: Client):
         """Given an video response dict from an album, return a new
@@ -787,7 +795,7 @@ class Tracklist(list):
         if self._download_item(item, **kwargs):
             item.convert(**kwargs["conversion"])
 
-    def _download_item(item, **kwargs):
+    def _download_item(item, *args: Any, **kwargs: Any) -> bool:
         """Abstract method.
 
         :param item:
diff --git a/streamrip/metadata.py b/streamrip/metadata.py
index 0a4e2f5..7fb7d16 100644
--- a/streamrip/metadata.py
+++ b/streamrip/metadata.py
@@ -62,7 +62,7 @@ class TrackMetadata:
         self.title: str
         self.album: str
         self.albumartist: str
-        self.composer: str
+        self.composer: Optional[str] = None
         self.comment: Optional[str] = None
         self.description: Optional[str] = None
         self.purchase_date: Optional[str] = None
diff --git a/streamrip/tracklists.py b/streamrip/tracklists.py
index 9a95095..11444fd 100644
--- a/streamrip/tracklists.py
+++ b/streamrip/tracklists.py
@@ -9,7 +9,7 @@ import logging
 import os
 import re
 from tempfile import gettempdir
-from typing import Dict, Generator, Iterable, Union
+from typing import Dict, Generator, Iterable, Union, Optional
 
 import click
 from pathvalidate import sanitize_filename
@@ -54,8 +54,11 @@ class Album(Tracklist):
 
         self.sampling_rate = None
         self.bit_depth = None
-        self.container = None
+        self.container: Optional[str] = None
 
+        self.disctotal: int
+        self.tracktotal: int
+        self.albumartist: str
         # usually an unpacked TrackMetadata.asdict()
         self.__dict__.update(kwargs)
 
@@ -148,7 +151,7 @@ class Album(Tracklist):
             for item in self.booklets:
                 Booklet(item).download(parent_folder=self.folder)
 
-    def _download_item(
+    def _download_item(  # type: ignore
         self,
         track: Union[Track, Video],
         quality: int = 3,
@@ -411,7 +414,7 @@ class Playlist(Tracklist):
         self.__download_index = 1  # used for tracknumbers
         self.download_message()
 
-    def _download_item(self, item: Track, **kwargs):
+    def _download_item(self, item: Track, **kwargs) -> bool:  # type: ignore
         kwargs["parent_folder"] = self.folder
         if self.client.source == "soundcloud":
             item.load_meta()
@@ -578,7 +581,7 @@ class Artist(Tracklist):
         self.download_message()
         return final
 
-    def _download_item(
+    def _download_item(  # type: ignore
         self,
         item,
         parent_folder: str = "StreamripDownloads",