2012. - Can't stand still (from the musical 'Footloose') ,Du ganz allein (from the musical 'We Will Rock You') ,I will crumble (from the movie 'Wuthering Heights') duet with Roberta Valentini - Seibert, Mark / ..
2010. - seibert, mark / verkaik, willemijn - i will be tre,seibert, mark - no one but you ( we will rock you),seibert, mark - gethsemane (jesus christ superstar,seibert, mark / verkaik, willemijn - solang..
