El autor de la canción es por defecto el artista del álbum

LyricsPy/templates/add_song.html

@@ -12,7 +12,7 @@
     <label for="album_id">Álbum:</label>
     <select id="album_id" name="album_id" required>
         {% for album in albums %}
-        <option value="{{ album.id }}">{{ album.name }} by {{ album.artist }}</option>
+        <option value="{{ album.id }}" data-artist="{{ album.artist }}">{{ album.name }} by {{ album.artist }}</option>
         {% endfor %}
     </select>
     
@@ -21,4 +21,18 @@
     
     <button type="submit">Añadir canción</button>
 </form>
+
+<script>
+    function updateAuthor() {
+        var albumSelect = document.getElementById("album_id");
+        var selectedAlbum = albumSelect.options[albumSelect.selectedIndex];
+        var artist = selectedAlbum.getAttribute("data-artist");
+        document.getElementById("author").value = artist;
+    }
+
+    // Initialize the author field with the artist of the first album
+    document.addEventListener('DOMContentLoaded', function() {
+        updateAuthor();
+    });
+</script>
 {% endblock %}