400 students sing for their teacher battling cancer

A teacher, who has been battling an aggressive form of cancer and was having a really rough time with his treatment, shared a heartwarming moment with about 400 of his students. 

After hearing how their teacher was battling, the students dropped everything and arrived at his house to sing for him. 

See: Heartwarming moment a little girl sees her dad after school!

"This was a spur of the moment decision to go... Students were in the middle of class... some taking quizzes and tests… and dropped everything for a bigger lesson on life, love, community, compassion," wrote fellow teacher Leslie Ponder on Facebook.

The video is magnificent and you'll see why it's been viewed over 23-million times in just three days when you watch it.