diff --git a/lib/testing/song_test.py b/lib/testing/song_test.py
index babeced17..b7edf6da5 100644
--- a/lib/testing/song_test.py
+++ b/lib/testing/song_test.py
@@ -27,6 +27,11 @@ def test_has_genres(self):
         assert("Rap" in Song.genres)
         assert("Pop" in Song.genres)
         assert("Rock" in Song.genres)
+        
+        
+    def test_unique_genres(self):
+        '''all song genres are unique.'''
+        assert len(Song.genres) == len(set(Song.genres))
 
     def test_has_artists(self):
         '''keeps track of all Song artists.'''
@@ -34,6 +39,10 @@ def test_has_artists(self):
         assert("Beyonce" in Song.artists)
         assert("Hall and Oates" in Song.artists)
         
+    def test_unique_artists(self):
+        '''all song artists are unique.'''
+        assert len(Song.artists) == len(set(Song.artists))
+        
     def test_has_genre_count(self):
         '''keeps count of Songs for each genre.'''
         assert(Song.genre_count["Rap"] == 1)