def add_tracks(self, subtracks):
        """
        Add one or more tracks.

        subtrack : Track or iterable of Tracks
        """
        if isinstance(subtracks, BaseTrack):
            subtracks = [subtracks]
        for subtrack in subtracks:
            self.add_child(subtrack)
            self.subtracks.append(subtrack)
Add one or more tracks.

        subtrack : Track or iterable of Tracks