diff --git a/src/music_kraken/audio_source/fetch_audio.py b/src/music_kraken/audio_source/fetch_audio.py
index 224304d..b09f24c 100644
--- a/src/music_kraken/audio_source/fetch_audio.py
+++ b/src/music_kraken/audio_source/fetch_audio.py
@@ -32,47 +32,44 @@ print(EasyID3.valid_keys.keys())
 
 class Download:
     def __init__(self):
-        for row in database.get_tracks_to_download():
-            row['artist'] = [i['name'] for i in row['artists']]
-            row['file'] = os.path.join(MUSIC_DIR, row['file'])
-            row['path'] = os.path.join(MUSIC_DIR, row['path'])
+        for song in database.get_tracks_to_download():
+            song['artist'] = [i['name'] for i in song['artists']]
+            song['file'] = os.path.join(MUSIC_DIR, song['file'])
+            song['path'] = os.path.join(MUSIC_DIR, song['path'])
 
-            if self.path_stuff(row['path'], row['file']):
-                self.write_metadata(row, row['file'])
+            if self.path_stuff(song['path'], song['file']):
+                self.write_metadata(song, song['file'])
                 continue
 
-            # download_success = Download.download_from_src(row['src'], row)
-            sources = row['source']
-            for source in sources:
-                if source['src'] is None:
-                    continue
-                download_success = Download.download_from_src(source['src'], source['url'], row)
+            # download_success = Download.download_from_src(song['src'], song)
+            for source in song.sources:
+                download_success = Download.download_from_src(source.src, source.url, song)
                 if download_success != -1:
                     break
                 else:
-                    logger.warning(f"couldn't download {row['url']} from {row['src']}")
+                    logger.warning(f"couldn't download {song['url']} from {song['src']}")
 
             """
             download_success = None
-            src = row['src']
+            src = song['src']
             if src == 'musify':
-                download_success = musify.download(row)
+                download_success = musify.download(song)
             elif src == 'youtube':
-                download_success = youtube.download(row)
+                download_success = youtube.download(song)
             """
 
-            self.write_metadata(row, row['file'])
+            self.write_metadata(song, song['file'])
 
     @staticmethod
-    def download_from_src(src, url, row):
+    def download_from_src(src, url, song):
         if src not in sources:
             raise ValueError(f"source {src} seems to not exist")
         source_subclass = sources[src]
 
-        return source_subclass.fetch_audio(url, row)
+        return source_subclass.fetch_audio(url, song)
 
     @staticmethod
-    def write_metadata(row, file_path):
+    def write_metadata(song, file_path):
         if not os.path.exists(file_path):
             logger.warning(f"file {file_path} doesn't exist")
             return False
@@ -86,11 +83,11 @@ class Download:
 
         valid_keys = list(EasyID3.valid_keys.keys())
 
-        for key in list(row.keys()):
-            if key in valid_keys and row[key] is not None:
-                if type(row[key]) != list:
-                    row[key] = str(row[key])
-                audiofile[key] = row[key]
+        for key in list(song.keys()):
+            if key in valid_keys and song[key] is not None:
+                if type(song[key]) != list:
+                    song[key] = str(song[key])
+                audiofile[key] = song[key]
 
         logger.info("saving")
         audiofile.save(file_path, v1=2)
diff --git a/src/music_kraken/database/database.py b/src/music_kraken/database/database.py
index d8d7e38..bcfd770 100644
--- a/src/music_kraken/database/database.py
+++ b/src/music_kraken/database/database.py
@@ -1,3 +1,4 @@
+from typing import List
 import sqlite3
 import os
 import logging
@@ -193,7 +194,7 @@ GROUP BY track.id;
         """
         return query
 
-    def get_custom_track(self, custom_where: list):
+    def get_custom_track(self, custom_where: list) -> List[song.Song]:
         query = Database.get_custom_track_query(custom_where=custom_where)
         return [song.Song(json.loads(i[0])) for i in self.cursor.execute(query)]
 
@@ -205,19 +206,19 @@ GROUP BY track.id;
 
         return resulting_tracks[0]
 
-    def get_tracks_to_download(self):
+    def get_tracks_to_download(self) -> List[song.Song]:
         return self.get_custom_track(['track.downloaded == 0'])
 
-    def get_tracks_without_src(self):
+    def get_tracks_without_src(self) -> List[song.Song]:
         return self.get_custom_track(["(track.url IS NULL OR track.src IS NULL)"])
 
-    def get_tracks_without_isrc(self):
+    def get_tracks_without_isrc(self) -> List[song.Song]:
         return self.get_custom_track(["track.isrc IS NULL"])
 
-    def get_tracks_without_filepath(self):
+    def get_tracks_without_filepath(self) -> List[song.Song]:
         return self.get_custom_track(["(track.file IS NULL OR track.path IS NULL OR track.genre IS NULL)"])
 
-    def get_tracks_for_lyrics(self):
+    def get_tracks_for_lyrics(self) -> List[song.Song]:
         return self.get_custom_track(["track.lyrics IS NULL"])
 
     def add_lyrics(self, track_id: str, lyrics: str):
diff --git a/src/music_kraken/database/song.py b/src/music_kraken/database/song.py
index 62df16f..a49e70d 100644
--- a/src/music_kraken/database/song.py
+++ b/src/music_kraken/database/song.py
@@ -1,3 +1,6 @@
+from typing import List
+
+
 class Artist:
     def __init__(self, artist_data) -> None:
         self.artist_data
@@ -20,7 +23,7 @@ class Song:
         self.title = self.json_data['title']
         self.artists = [Artist(a) for a in self.json_data['artists']]
 
-        self.sources = []
+        self.sources: List[Source] = []
         for src in self.json_data['source']:
             if src['src'] is None:
                 continue