During the 1970s, calypso's popularity waned throughout the world, including the Caribbean. Derivatives include an uptempo version of Calypso music called soca, and a hip-hop-influenced style called rapso both became popular in Trinidad and other islands. Soca was by the more influential in terms of international sales, since rapso's crossover appeal to mainstream tastes has been extremely limited. Old-time calypsonians and purists, however, preferred rapso's continuation of the lyrical ambidexterity that helped make calypso the world-famous, innovative art form it has become; many criticized soca's perceived watering-down of calypso, including veteran calypsonians such as Chalkdust, who asked: "Are we to put water in the brandy, singing just two or three words mainstream audiences can understand and dance to?" Indo-Trinidadians began popularising chutney music during the same time period. In the mid-1970s, artists like Sundar Popo made the music mainstream.