They began in the late 1940s among people from the inner city of Kingston, who were not able to participate in dances uptown. Social and political changes in late-1970s Jamaica, including the change from the socialist government of Michael Manley (People's National Party) to Edward Seaga (Jamaica Labour Party), were reflected in the shift away from the more internationally oriented roots reggae towards a style geared more towards local consumption and in tune with the music that Jamaicans had experienced when sound systems performed live. Themes of social injustice, repatriation and the Rastafari movement were overtaken by lyrics about dancing, violence and sexuality. Though the revolutionary spirit was present in Jamaica due to this social upheaval, the radio was very conservative and failed to play the people’s music. It was this gap that the sound system was able to fill with music that the average Jamaican was more interested in.