Elton John couldn't perform in 'Living Room Concert for America,' but Mariah Carey, others did

Problem is that John, who just turned 73, is self-isolating at a house not built for concerts, even home concerts.

"I have to be quarantined in the only house I have ever been in without a piano," John said from a table in a lavishly decorated home.

Fortunately, John served as master of ceremonies as other performers sang in the concert that was live-streamed online and aired on Fox.

The highlights:

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• Mariah Carey, celebrating her 50th birthday, which was Friday, sang "Be My Baby," dedicating the song to her two children, "for staying with me at home, and not complaining too much."

"I'm going to put my gloves on, even in my house," Carey said, ending the song.

• Billie Eilish sat on her living room couch in Los Angeles with her brother, Finneas, on the one-year anniversary of her Grammy-dominating album, "When We All Fall Asleep, Where Do We Go?" The duo performed an acoustic version of "Bad Guy."

• Demi Lovato appeared from her New York City home, playing the piano and singing a soulful version of "Skyscraper."
 

I have chills from @ddlovato's performance of "Skyscraper" ✨

Tune in now on @FOXTV: https://t.co/F2LOxSbA0m #iHeartConcertOnFOX pic.twitter.com/tetPg4SWll

— iHeartRadio (@iHeartRadio) March 30, 2020

A plaid-flannel-shirt-wearing David Grohl strummed an acoustic version of "My Hero" dedicated to first responders. "And if you sing that last chorus every time you wash your hands, I think you'll be in good shape," Grohl said.

• Camila Cabello, quarantined in Miami with Shawn Mendes, let her boyfriend play guitar ("He's taking over and just killing it") while she sang "My Oh My," peeking at her iPhone for the complicated lyrics.

• Tim McGraw performing "Something Like That" while sitting on the end of his home pool's diving board. Despite the wind in the background, and a cameo by his dog, McGraw was impressed. "We could do a whole concert like this," he said.

• Sam Smith, in his bedroom in London, sang an a capella version of "How Do You Sleep" 

• Ellen DeGeneres admitted to "wearing the same sweat pants three days in a row" at home. The talk show host introduced H.E.R. for a solo guitar performance across the country in her New York City living room.
 

Thank you for everything, @eltonofficial ❤️ We love you!#iHeartConcertOnFOX pic.twitter.com/0PwD1h5v8I

— iHeartRadio (@iHeartRadio) March 30, 2020

Russell Wilson and wife Ciara gave a view inside their child-filled living room, while Lady Gaga urged viewers to "find joy however you can" during the crisis.

The performers encouraged viewers to support two charitable organizations helping victims and first responders during the pandemic: Feeding America and First Responders Children’s Foundation.

"Everyone out there fighting to keep us safe is such an inspiration," said John.

The performer did produce his son's keyboard to sing a few lines from "Don't Let the Sun Go Down On Me" to end the concert.