> objects in the <code>Playlist</code>. The return type
		of the <code>get_duration</code> method will be a tuple of minutes and seconds. Here is the code for <code>get_duration</code>:
	</p>
	<pre>
def get_duration(self):
    """ (Playlist) -> (int, int)

    Return the duration of this playlist as tuple of minutes and
    seconds.

    >>> playlist = Playlist('Canadian Artists')
    >>> playlist.add(song.Song('Neil Young', 'Harvest Moon', 5, 3))
    >>> playlist.add(song.Song('Serena Ryder', '