Michael Jackson walked in to meet the orchestra. He wasn’t ready for what they did.

Michael Jackson recorded most of his music the slow way, alone in a booth, one careful take at a time. But there was one song he wanted to do differently. He wanted a full orchestra in the room, playing live, while he sang.

The song was “Smile.”

You might not know the name, but you know the tune. It was written by Charlie Chaplin, the silent-film comedian with the little mustache and the cane, for his 1936 movie “Modern Times.” Michael loved that song his whole life. He called it his favorite, and he put his own version on his 1995 album “HIStory.”

To record it the way he wanted, the team brought a full orchestra into the Hit Factory, a well-known recording studio in New York. Michael stood and sang while the musicians played along with him in real time. That’s a hard thing to pull off, and it doesn’t happen on most pop records.

The man running the session was Bruce Swedien. He was Michael’s recording engineer for years, going all the way back to “Thriller,” and he was the one shaping every sound while Michael sang. Swedien later wrote about these nights in his 2009 book about working with Michael.

When the take was finished, Michael didn’t just pack up and leave. He asked to go out and meet the musicians, to thank the people who’d played for him. So he walked out of the booth and into the big room where the whole orchestra was still sitting.

Here’s the part Swedien held onto for the rest of his life.

The moment Michael walked in, every single player stood up. Then they started tapping their bows against their music stands, as loud as they could.

If you’ve never been around an orchestra, that might sound odd. But that tapping is how these musicians clap. A violin or cello player can’t really put their hands together, not with a bow in one hand and an instrument in the other, so instead they rap the bow on the stand. When a whole room of them does it at once, it’s loud, and it means something. It’s their way of saying thank you and well done.

And they were saying it to Michael.

Swedien said Michael was thrilled. Here was a man who’d heard stadiums full of people scream his name, standing in a quiet studio, getting the one kind of applause he probably didn’t hear very often. The respect of real musicians, bow on wood, just for him.

There’s no film of that night. No cameras were rolling while the orchestra tapped their stands for him. It lives on only because the people who were there, Swedien most of all, never let it go.