On 14 March 2011, an audience of 5,190 classical music fans at the "Big Red Nose Show" held in the Royal Albert Hall in London, UK, formed a kazoo ensemble as part of Red Nose Day. Accompanied by the BBC Concert Orchestra and led by comedienne Sue Perkins, the ensemble hummed-out renditions of Wagner's Ride of the Valkyres and Eric Coates' Dambusters March. The event was hosted by BBC Radio 3's Katie Derham and Basil Brush.
Please note: Comments below may relate to previous holders of this record.