Dozens of events are planned across the capital for the musical celebration, on July 10-11, including performances in schools to "street pianos" in London squares.

The aim is to inspire and encourage musical participation, especially by those who may be less experienced or doing it for the first time.

Johnson says, "We are planning a magnificent programme of events to get young Londoners enthused about music making, and give them a chance to shine. London's thriving music scene is known ...