Jeremiah Succar is the adorable 7-year-old you see in the video above, who has been battling Stage Four atypical rhabdoid teratoid since May. He got the surprise of a lifetime a few weeks ago when Rachel Platten performed a duet with him on his hospital bed at Children's Hospital Los Angeles.

Throughout his treatment, Jeremiah memorized the lyrics to "Fight Song" and it' become his anthem for staying strong and positive.

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