Between 1965 and 1973, the United States and Great Britain were going to conceive and execute a plan which involved the deportation of about two thousand islanders to set up a military base on the island of Diego Garcia located right in the middle of the Indian Ocean. Beyond the strategic, political and financial stakes, only one form of cultural practices managed to capture the joys, the pain and the hopes of that population: the ségas and the çantés. Indeed, the musical culture became the medium of choice of a then mostly illiterate population. Hence, all the songs of the Chagos shared a common heritage: the permanent evocation of the lost islands. Therefore, the objective of this paper is to show how the collective imagination of the exiled population is essentially portrayed in songs that initially referred to everyday life in their former place of abode. Once the spoliation process came into effect, the songs started to focus on a return to a fantasy island which with time has acquired mythical overtones.