Imagine this mom's joy, after spending 6 months to teach her autistic son the letter 'A', and he just starts singing one of the biggest songs on the radio.

Whether you like a particular song or not, music is powerful. One song that has little to no affect on you, may completely change another person's life.

Sheletta Brundidge's 4-year-old son, Daniel, has nonverbal autism. Daniel doesn't talk. His mom spends her life without his sweet, little voice in her ears. Until a song, many love to hate, changed her and her son's whole world.

This Minnesota mom's story, that has touched hearts nationwide, started from this tweet:

CBS Chicago has more of this incredible story of the power of music, in the video below.