 it is possible
        for the total number of seconds for all the songs to be greater than 60. For instance, assume a song that is 3:35 (3 minutes and
        35 seconds) long, and another song that is 2:50 (2 minutes and 50 seconds) long. If we simply add these two songs just as the 
        above <code>get_duration</code> method does, we will get a tuple (5, 85) or 5 minutes and 85 seconds.
        However, this is not a nice way to report the total
        duration of the songs. The correct thing 