As has become customary every 12 months or so, the cavernous Fundição Progresso opens its doors to some heavy dub reggae rhythms courtesy of Groundation. The American headliners, taking their name from rastafarian holy occasion Grounation Day, are a nine-piece band injecting some jazz and soul into the usual mix of Marley covers, upping the horns and producing a rich, enveloping sound that has won them a huge festival following, not to mention the hearts of the Lapa reggae brigade.