The Hyde Park Commonwealth Concert. Five stages will be created in the Royal Park, each representing a continent within the Commonwealth.
A whole host of world music artists will each take to their home stage to give a flavour of their country's music.
The Queen launches BBC Music Live to start street festivals in over 200 towns and cities throughout the UK.
The whole country sings All You Need is Love by the Beatles.
Wherever you are in the UK, in city centres, towns and villages. Even in your street, back garden or on your sofa, you can take part in the performance.
All you have to do is watch BBC 1 or listen to your BBC local radio station.