save project

my_music.py

@@ -56,12 +56,19 @@ while True:
                 if x>120 and x<220 and y>350 and y<430:
                     num-=1
                     if num<0:
-                        if num > len(music_list)-1:                   
-                            num+=1
-                        pygame.mixer.music.play(num-1)
-                        click=0
-                        play_button = stop_img
-
+                        num = len(music_list)-1  
+                    pygame.mixer.music.load(music_list[num])                                  
+                    pygame.mixer.music.play()           
+                    click=0
+                    play_button = stop_img
+                if x>420 and x<520 and y>350 and y<450:
+                    num+=1
+                    if num<0:
+                        num = len(music_list)+1  
+                    pygame.mixer.music.load(music_list[num])                                  
+                    pygame.mixer.music.play()           
+                    click=0
+                    play_button = stop_img
 
 
     if pygame.mixer.music.get_busy() == False: