Now Playing: 'American Idol' top 24

Now Playing: 'American Idol' Monday: The top 14

Now Playing: 'Night Court' actor Harry Anderson dies at the age of 65

Now Playing: US runners describe Boston Marathon show of sportsmanship

Now Playing: 'American Idol' top 14 contestants revealed

Now Playing: Beyonce donates $100K in scholarships

Now Playing: Francis Marion University choir performs live on 'GMA'

Now Playing: Inside the split between John Cena and Nikki Bella

Now Playing: Kendrick Lamar wins Pulitzer Prize for 'Damn'

Now Playing: What will Prince Harry, Meghan Markle say in their wedding vows?

Now Playing: Meet this adorable dog with ears like Mickey Mouse

Now Playing: Star says it was like 'no time had passed' when 'Roseanne' cast reunited

Now Playing: Taylor Hicks discusses the highlights of last night's 'American Idol'

Now Playing: How Meghan Markle channels Princess Diana's humanitarianism

Now Playing: Beyonce is 1st woman of color to headline Coachella

Now Playing: Carrie Underwood returns to the stage for 1st public appearance since accident

Now Playing: Exclusive 'Roseanne' sneak peek: Darlene and David reunite

Now Playing: 'American Idol': A night of mind-blowing solos

Now Playing: Beyonce and Destiny's Child reunites in Coachella

Now Playing: Coachella 2018 kicks off with The Weeknd