» Country remix: Billy Ray Cyrus joins rapper Lil Nas X in 'Old Town Road'

"Daniel went from humming to actually singing the lyrics," Brundidge told Today Parents. "I was crying so hard that tears were dropping on his head. I was like, 'This is the beginning. This is the light!' It took him 6 months to learn the letter 'A' using flash cards, but he taught himself a song all by himself."

» Atlanta's Lil Nas X thanks Billy Ray Cyrus with a $150K gift

Cyrus retweeted Brundidge, but the Lithia Springs High School grad, whose real name is Montero Lamar Hill, responded with a tweet of his own.

“Old Town Road” quickly climbed the Billboard charts in April and gained national attention when Billboard removed it from the Hot Country Songs chart, declaring it not country enough.

» Billboard removes rapper Lil Nas X's 'Old Town Road' from country charts

» Atlanta rapper Lil Nas X's removal from country music chart sparks controversy

The song has now spent nine weeks at No. 1 on Billboard's Hot 100 chart and even broke the streaming record previously held by Drake.

The Atlanta rapper recently partnered with Wrangler and released a clothing line inspired by the song.

» 'This is how you lose customers': Everyone isn't happy about Lil Nas X, Wrangler collection

Check out the video, below, if you’re not familiar with the song.