Children aged three to 11 years old at Boxmoor Primary School sang and signed a song as part of a world record attempt under fundraising initiative Sign2Sing.
They joined children from across the country in the singing and signing challenge on Wednesday.
The annual fundraiser in aid of Sign Health - a charity for vulnerable deaf children and adults - is now in its fourth year. This is the second time that Boxmoor youngsters have taken part and they plan to be involved next year. They also paid £1 each to wear their favourite scarves for the day to help boost the charity total.
Music teacher Cath Toms, who taught the children the song - Get Up And Sign - is awaiting to hear from the organisation as to whether the current world record has been broken.