Luke Bryan took a break from his schedule to talk to one of his biggest fans, a 4-year-old named Riley.

After Bryan's recent performance in Saratoga Springs, N.Y., Albany radio station WGNA received a letter from Riley's mother, Marjorie, telling them about the impact Bryan's music has had on her son, who has Asperger's Syndrome.

“When Riley pretends to be Luke, he is a whole other person. He not afraid or shy. He has confidence and feels free. Every time Luke turned his hat around during the concert, so did Riley," she says. "I just want Luke and all other artists to know that their music is a powerful thing and truly helps those with disabilities to express themselves and get through rough parts of their day.”

WGNA passed the letter on to Bryan, and he agreed to call in and talk to Riley while he and his mom were on a tour of the studio.

“We went to Luke’s concert Sunday night and had great seats," Marjorie says in the letter. "It looked like [Luke] tried to read my son’s shirt, but couldn’t or didn’t understand it. It said ‘Luke Bryan is one of the pieces to my puzzle,’ and he truly is.”

Turns out, Bryan did see the shirt from stage, but he didn't know that it had anything to do with Autism.

"I remember reading that shirt from stage, and I just had never known that 'you're the piece to my puzzle' was an autism statement. I just remember reading it and thinking, 'Well, that's an interesting thing to put on a shirt,' Bryan says. "To find out the whole story later is really amazing. I'm kind of having some tears on the bus here."

Check out the full video above.