Olivia Newton-John became an international superstar in the 1978 movie Grease, where she played Sandy and sang a number of classics, including “Hopelessly Devoted to You,” “Summer Nights,” and “You’re the One That I Want.” But before that, she was a country music star. She won two Grammy Awards in country music categories, Female Vocalist for the CMA in 1976 and New Female Vocalist for the ACMs the same year.

As the world mourns her death this week, we look at ten of her most significant and best country hits.