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

    total_minutes = 0
    total_seconds = 0

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

    return (total_minutes + total_seconds // 60,  total_seconds % 60)
    </pre>
    <p>
Finally, we will write a <code>__str__</code> method in order to have a nice output
        when the <code>print</code> function is called on our <code>Playlist</code> obj