The Royal Opera shares the "Orchestra of the Royal Opera House", which is a permanent orchestra of full symphony orchestra size, with the Royal Ballet. It has its own permanent chorus with over forty five singers: the Royal Opera Chorus. A third group of musicians on salary are the members of the "Jette Parker Young Artists Programme", who receive advanced professional training. They are not students as the term is usually understood, as most of them have performed professionally at opera houses of some standing previously, but the programme is intended to accelerate their careers by gaining experience at one of the world's leading opera companies. The programme lasts for two years, with a new intake each summer. Most of the "Young Artists" are singers, but they also include conductors, répétiteurs and stage directors.