save project

my_music.py

@@ -50,6 +50,12 @@ 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
+                    pygame.mixer.music.load(music_list[num])
+                     pygame.mixer.music.play()
 
     if pygame.mixer.music.get_busy() == False:
         num += 1