public void songToSongbook (Songbook songbook) {
        String title = null;
        String composer = null;
        String lyricist = null;
        String origTitle = null;
        String origComposer = null;
        String note = null;
        Song origTune = null;
        if (tokens.length > 1)
            title = tokens[1];
        if (tokens.length > 2)
            composer = tokens[2];
        if (tokens.length > 3)
            lyricist = tokens[3];
        if (tokens.length > 4)
            origTitle = tokens[4];
        if (tokens.length > 5)
            origComposer = tokens[5];
        if (tokens.length > 6) 
            note = tokens[6];
        if (origTitle != null && origTitle.length() > 0) {
            origTune = new Song();
            origTune.setTitle (origTitle);
            origTune.setComposer (origComposer);
            
        }
        Song song = new Song ();
        song.setTitle(title);
        song.setComposer(composer);
        song.setLyricist(lyricist);
        song.setNote(note);
        song.setOriginalSong(origTune);
        songbook.addSong(song);
    }