Stompa', 3, 15)
    >>> playlist.duration()
    (8, 18)
    """

    total_minutes = 0
    total_seconds = 0

    for song in self.songs:
        total_minutes = total_minutes + song.minutes
        total_seconds = total_minutes + song.seconds

    return (total_minutes,  total_seconds)
	</pre>
	<p>
        We use two accumulators: one to keep track of the sum of the minutes for all songs in the playlist, and another one to keep track of the sum of the seconds for all songs in the playlist. W