Andy Grammer wasn't prepared for this children's chorus.

This video has gone viral in the past, but it is so good that it isn't a one-and-done type of viral: it keeps coming back.

In the video, Andy Grammer teams up with a public school children's chorus to sing his "Don't Give Up On Me" and, judging by Grammer's reaction after the song is over, he wasn't expecting the performance he received.

According to SI Live, Andy Grammer was asked to perform for a CNN television special and, backing him, the students of PS22.

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PS22 is New York Public School 22 in Staten Island, NY. PS 22 and its Chorus Director Gregg Brienberg are fairly well known in the children's chorus circles, as Brienberg does a great job with the students each year.

The students practiced for the performance and, from what I understand, this is the first time that Grammer performs the song with the children as a rehearsal for the show.

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The CNN special  they were rehearsing for was titled, "CNN Heroes: An All-Star Tribute", and it aired on December 11, 2019. This rehearsal, of course, happened sometime prior to the television special, though we don't know the exact date.

Allow me to set the scene for this video: one piano, two guitars, an auditorium, Andy Grammer, 65 10-year-old back-up singers, and one infectious song.

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After the performance, he let out a "whew!" and then told the choir director that he didn't expect their performance to affect him like it did.

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Turn the volume up on this one and get ready for goose bumps.

As you can see, Grammer was so moved by the performance that he needed to wipe away tears.

For the television performance that aired on CNN in December of 2019, it appears that the chrous was cut in about half. Here is a video of that performance.

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