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This is probably one of the most emotional videos you will ever watch.
When teacher Ben Ellis made the decision to stop treatment for an aggressive form of cancer, he really didn't expect this to happen.
The news of his decision reached the pupils at Christ Presbyterian Academy in Nashville and they decided to do something so magical it will melt your heart.
Over 400 pupils from the school turned up to surprise their teacher to sing hymns to him outside his window.
The moment was filmed from the window, looking down on the pupils who's song Holy Spirit You are Welcome rang out through the neighbourhood.
Ben Ellis has been teaching at the school in Nashville since 2008, and was diagnosed with oesophageal cancer in December last year, but made the decision to stop the treatment last week.
Leslie Ponder, a teacher at CPA, said the trip was a "spur-of-the-moment decision".
"Today these students learned more than they would have in a classroom."
Mr Ellis described the singing by the entire student body as "beautiful and unforgettable".
"I have never felt so weak but God is strong in me," he said.