private void AddMenuItem_Click(object sender, EventArgs e)
        {
            SongEditorForm sef = new SongEditorForm(null);

            if (sef.ShowDialog() == DialogResult.OK)
            {
                Song newSong = new Song(sef.SongTitle, sef.SongAuthor, sef.SongRelease, sef.SongGenre);
                songsModel.AddSong(newSong);
            }
        }
 private void ModifyMenuItem_Click(object sender, EventArgs e)
 {
     foreach (ListViewItem item in songsListView.SelectedItems)
     {
         Song           song = (Song)item.Tag;
         SongEditorForm sef  = new SongEditorForm(song);
         if (sef.ShowDialog() == DialogResult.OK)
         {
             songsModel.ModifySong(song, sef.SongTitle, sef.SongAuthor, sef.SongRelease, sef.SongGenre);
         }
     }
 }