olivia newton-john

She had the entire audience singing along.

The singer and actor both paid tribute to Olivia Newton-John after her death.

After Newton-John's death, Wynonna Judd shared a remembrance with her fans on social media.

Urban and his wife, Nicole Kidman, offered a touching memorial statement for Newton-John in the wake of her death.

Newton-John and Travolta starred opposite one another as Sandy and Danny in the 1978 film Grease. The movie and the soundtrack was a generational success.

The 'Physical' singer and international icon was previously diagnosed with breast cancer.

She was one of the biggest multi-genre stars of her generation.

Not every artist finds country success when coming in from a different genre ... but these men and women did!

There are many -- too many -- country stars who have had cancer or have been personally affected by it in some way.