According to Official Guinness Records,
The largest Wobble Board Ensemble was achieved by 1,207 participants from Harristown State High School who played to 'Tie Me Kangaroo Down, Sport' in Toowoomba, Queensland, Australia, on 22 August 2008.
They played for over 6 minutes.
For a complete list of 2009 records, please visit 2009 Guinness Records in Australia.