It was Emma E. Booker Elementary School in Sarasota, Florida. https://www.wfla.com/remembering-9-11/remembering-9-11-student-recalls-day-president-bush-came-to-his-sarasota-elementary-school/

Teacher's name was Kay Daniels: https://www.sarasotamagazine.com/news-and-profiles/2021/09/president-bush-sarasota-elementary-school-9-11

"Daniels did not show them any media coverage for fear of traumatizing them. Instead, she sang a gospel song, “Hold On (Change is Comin’),” to comfort them."

Here are the lyrics which include this:

Yesterday, a man step to me He said, "How can you smile When your world is crumbling down?" I said "Here's my secret, when I wanna cry I take a look around and I see that I'm getting by"

And I hold on (hold on) Change is coming (change is coming) Hold on (hold on) Don't you worry (don't worry 'bout a thing)

https://www.lyrics.com/lyric/2066684/Sounds+of+Blackness/Hold+On+(Change+Is+Comin')

It was Emma E. Booker Elementary School in Sarasota, Florida.