save project

my_music.py

@@ -49,7 +49,7 @@ while True:
             #
             if x >420 and x<520 and y>350 and y<400:
                 num+=1
-                if num >3:
+                if num >len(music_list)-1:
                     num =0
                 pygame.mixer.music.load(path+'\\'+music_list[num])
                 pygame.mixer.music.play()