Apple CEO Tim Cook joined Lady Gaga on 'The Tonight Show' to announce a $10 million donation for fighting coronavirus

• Apple CEO Tim Cook appeared in a surprise Facetime phone call with Lady Gaga on "The Tonight Show" on Monday night.
• Cook's appearance was part of a planned announcement: Apple is donating $10 million to Gaga's "One World: Together at Home" fundraiser event, which directly supports the World Health Organization's fight against the spread of coronavirus.
• "One World: Together at Home" is scheduled to air on April 18, and will feature a cavalcade of celebrities - from Elton John to Billie Eilish.
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