Christopher Cross, the singer-songwriter, has tested positive for coronavirus (COVID-19).

In a Facebook post on Friday, the Grammy- and Oscar winning musician best known for his 1980s hit song “Sailing” and “Arthur’s Theme (Best That You Can Do)” from the comedy Arthur wrote:

“I’m sorry to report that I am among the growing number of Americans who tested positive for the COVID-19 virus.This is possibly the worst illness I have ever had.”

He continued:

“For those of you who still do not believe the COVID-19 virus is real, or think it is a ‘hoax’ or part of some conspiracy, my advice to you is to understand right now that this is a deadly illness spreading like wildfire throughout the world.”

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In his post, Cross urged quarantined Americans to self-isolate and keep hope alive by being kind to one another:

“Wherever you are in the world, let’s all be kind to one another. Only if we work together can we defeat COVID-19.”

Cross, 68, now lives in Austin, Texas. He notably swept the Grammy Awards ceremony in 1981 winning in all four major categories, including Album of the Year, Record of the Year, Song of the Year and Best New Artist. He also won an Oscar in 1982 for his song “Arthur’s Theme (Best That You Can Do).”