Who are the amazing drum corps on the playa on Sat?

[reefus]

They grooved with some very practised and tight rhythms at the Burn itself- a group of about 8 drummers/percussionists, led by the bass drum who also had a samba whistle. It was the night of the burn that I saw them- and they attracted quite a crowd. They were terrific!

Does anyone know who these guys are, and where they can be heard?
Thanks. R