The US rock band, Red Hot Chili Peppers, will dedicate their headline show at Big Day Out to hardline conservationists Sea Shepherd.
The band, who have reportedly requested a "meditation room" and "non-alcoholic beers" before their Friday performance in Homebush, are keen supporters of the controversial environmental society.
Their performance will be accompanied by Sea Shepherd "digital visuals", incorporated into the main stage's backdrop.
Red Hot Chili Peppers' lead singer, Anthony Kiedis, is on the board of directors for the organisation.
Last May, Kiedis called for German authorities to stop the extradition of Sea Shepherd Captain, Paul Watson, to Costa Rica. Sea Shepherd is no stranger to celebrity endorsements.
Rock star Mick Jagger, surfing legend Kelly Slater and actors Christian Bale and Edward Norton are all benefactors of the group.
Last week, it was announced that former Greens leader Bob Brown was to take over Sea Shepherd's imminent Antarctic anti-whaling campaign.