Children from the borough are being invited to smash a work record signing event for charity.
SignHealth, which provides a service called Young DeafHope for young deaf people, is hoping 175,000 youngsters will take part.
The charity is hoping to break the attempt for the most people signing and singing a song at the same time.
Schools in Merton are being asked to sign up, while raising money for SignHealth.
Steve Powell, chief executive, said: "The money raised from the event will help us continue our work helping to improve the mental and physical health and well-being of deaf people, which includes our Young DeafHope project.
"The service provides support and counselling for people in Merton between 11 and 25-years-old experiencing abuse.
"Young DeafHope also offers outreach services at deaf youth groups, hearing impaired units, residential schools, refuges and support groups."
Visit sign2sing.org.uk for more information