The National Youth Orchestra of Great Britain (NYO) is an orchestra for young musicians in the United Kingdom. The members of the orchestra are all aged between 13 and 19 years. It is a very large orchestra with about 150 players. Children who want to play in the National Youth Orchestra have to be able to play their instrument very well. They need to be at least Grade 8 Distinction standard and they need to be very good at sightreading so that they can learn very quickly. They have to pass an audition to get a place in the orchestra. These auditions take place in the autumn in several towns in Britain.