In February 1969 Gil and Veloso were arrested by the Brazilian military government, brought from São Paulo to Rio de Janeiro, and spent three months in prison and another four under house arrest, before being freed on the condition that they leave the country. Veloso was the first to be arrested; the police moved to Gil's home soon afterward. Veloso had directed his then-wife Andréa Gadelha to warn Gil about the possibility of arrest, but Gil was eventually brought into the police van along with Veloso. They were given no reason or charge for their arrest. Gil believes that the government felt his actions "representa threat [to them, something new, something that can't quite be understood, something that doesn't fit into any of the clear compartments of existing cultural practices, and that won't do. That is dangerous." During his prison sentence, Gil began to meditate, follow a macrobiotic diet, and read about Eastern philosophy. He composed four songs during his imprisonment, among them "Cérebro Electrônico" ("Electronic Brain"), which first appeared on his 1969 album "Gilberto Gil 1969", and later on his 2006 album "Gil Luminoso". Thereafter, Gil and Veloso were exiled to London, England after being offered to leave Brazil. The two played a last Brazilian concert together in Salvador in July 1969, and travelled to Portugal, Paris, and London. He and Veloso took a house in Chelsea, with their wives and manager. Gil was involved in the organisation of the 1971 Glastonbury Free Festival and was exposed to reggae while living in London; he recalls listening to Bob Marley (whose songs he later covered), Jimmy Cliff, and Burning Spear. He was heavily influenced by and involved with the city's rock scene as well, performing with Yes, Pink Floyd, and the Incredible String Band. However, he also performed solo, recording "Gilberto Gil" ("Nêga") while in London. In addition to involvement in the reggae and rock scenes, Gil attended performances by jazz artists, including Miles Davis and Sun Ra.