status_bar = Label(root, text="", bd=1, relief=GROOVE, anchor=E)
status_bar.pack(fill=X, side=BOTTOM, ipady=2)


def play_time():
    current_time = pygame.mixer.music.get_pos() / 1000
    
    converted_current_time = time.strftime("%M:%S", time.gmtime(current_time))
    
    current_song = song_box.curselection()
    
    song = song_box.get(current_song)
    
    song = f"C:/gui/audio/{song}.mp3"
    
    song_mut = MP3(song)
    
    song_length = song_mut.info.length
    
    converted_song_length = time.strftime("%M:%S", time.gmtime(song_length))
    
    status_bar.config(text=f"Time Elapsed: {converted_current_time} of {converted_song_length}  ")
    
    status_bar.after(1000, play_time)
    
# В края на функцията stop добави
# status_bar.config(text="")

# и промени song = song_box.get(current_song) на song = song_box.get(ACTIVE)