Two years later, he starred in the film That'll Be the Day (1973) and recorded his international hit single, the self-penned "Rock On", in the same year. It sold over one million copies, and was awarded a gold disc by the R.I.A.A. in March 1974. It was nominated for a Grammy and reached No. 5 on the Billboard Hot 100. A second single, "Lamplight", also reached the Top 10 in the UK Singles Chart.
Essex's pop idol looks gave him a strong female fan base, and his British tours created scenes of hysteria reminiscent of Beatlemania. According to The Guinness Book of British Hit Singles, he was voted the number one British male vocalist in 1974, and was a teen idol for more than a decade.