diff --git a/beets/autotag/__init__.py b/beets/autotag/__init__.py
index b3cf6975ac..a5d677d2d1 100644
--- a/beets/autotag/__init__.py
+++ b/beets/autotag/__init__.py
@@ -218,7 +218,7 @@ def string_dist(str1, str2):
 
 def _plurality(objs):
     """Given a sequence of comparable objects, returns the object that
-    is most common in the set.
+    is most common in the set and if it is the only object is the set.
     """
     # Calculate frequencies.
     freqs = defaultdict(int)
diff --git a/beetsplug/lastid.py b/beetsplug/lastid.py
index fa37b07e94..99e60c9d47 100644
--- a/beetsplug/lastid.py
+++ b/beetsplug/lastid.py
@@ -70,8 +70,8 @@ def get_cur_artist(items):
                 artist_ids.append(last_data['artist_mbid'])
 
     # Vote on the most popular artist.
-    artist = autotag._plurality(artists)
-    artist_id = autotag._plurality(artist_ids)
+    artist, _ = autotag._plurality(artists)
+    artist_id, _ = autotag._plurality(artist_ids)
 
     return artist, artist_id