Country pop developed as a genre in the 70s following trends established by Nashville sound. Artists such as Glen Campbell and John Denver effectively blended elements of folk rock, country and pop. John Denver was particularly successful with many hits that combined country influences with his folk style such as Rocky Mountain High, Annie’s Song and Thank God I’m a Country Boy. A few years later in the mid-70s, Dolly Parton, who had roots in country music, began an extremely successful crossover into pop and Here You Come Again was highly popular. This success continued in the 80s when Dolly Parton and Kenny Rogers released the duet, Islands in the Stream.