save project

my_music.py

@@ -50,7 +50,11 @@ while True:
                     else:
                         play_button = play_img
                         pygame.mixer.music.pause()
-
+                if x > 120 and x < 220 and  y > 350 and y < 400:
+                    num -=1
+                    if num < 0:
+                        num = len(music_list)-1
+                    py 
     if pygame.mixer.music.get_busy() == False:
         pygame.mixer.music.play()