Elton John was so moved with Alicia Keys’ opening acoustic piano number to kick off “The iHeart Living Room Concert for America” Sunday night that he wanted to sing his own song.

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:

• 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.”

• 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.

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