Christina Henriette “Jerney” Kaagman is a Dutch singer musician and music executive best known as the lead singer for the progressive rock group Earth and Fire, with whom she scored a slew of international hits between 1969 and 1990. She recorded as a solo artist also, and after her career as a singer worked for the music industry, as president of the Dutch musicians' union BV Pop; as a public relations manager for a radio station; and on television, as a judge on television talent show Idols.