A 10-year-old boy with autism left shoppers shocked as he belted out a soulful rendition of Smokey Robinson’s “Who’s Lovin’ You.”

“He did not realize how good he was until he saw the video,” his mother, Tupney Courtney, 34, of Essex, England, told SWNS. “He said, ‘Mum, I’m actually really good.”

Calum Courtney, 10, is especially talented in music because of his autism, his mom said.

\”He taught himself to play the drums when he was 18 months old,\” Courtney explained. \”He loves how it feels and hearing the sound of his voice when he sings.\”

Because he also has a difficult time understanding social boundaries, Calum doesn\’t get nervous when performing in front of crowds.

His mom said shoppers did not even realize it was Calum singing when he burst into song.

\”The more people, the better for Calum when he is performing,\” his mom said. \”He has no nerves. If there\’s an audience, if there\’s anybody from one to 100 people to sing in front of he loves it. He just loves to sing.\”

The video, which quickly went viral after his aunt posted it to Facebook, has been seen more than a million times and has even captured the attention of a music producer who discussed featuring Calum in a charity album.

\”We describe his autism to him as a superpower, it may take a little from other areas of life but it’s given him the superpower of music.\”