The singer was a guest on daytime show The View, where she heard stories from the parents of baby Isabelle, who is recovering from an operation to remove a spinal cord tumour, and Eva, who took her first steps to Fight Song after becoming paralysed following brain tumour surgery.

Clearly moved by the touching accounts, Platten said, "I didn't go into music to make hit songs; I went into music to touch people's lives, and the fact that I get to do that with my first single, it's a dream come true. It's amazing."

The star later performed her hit song for her young fans as she wiped away tears at the piano.