Coldplay sang with 12-year-old Mexican youngster Huillo at their Mexico City stadium show, and the story is poignant. Huillo, who has autism, was crying with passion while Coldplay played “Fix You” at their earlier show in Mexico when his father took a video of him at six.

Chris Martin claimed “this video was the best video we’ve ever seen” when Coldplay returned to Mexico City. We cared more about it than any other video we made.” Next, the rocker had young Huillo sing his original song “Different is OK” onstage. Watch the crucial moment below.

Martin called Huillo “a very special young man.” He uses music to comprehend people, feelings, and the world. We heard one of his songs this week and invited him to sing with us.” As Huillo ascended the stage at the 65,000-person Foro Sol stadium, the audience chanted his name.

Huillo took lead vocals and played piano, undaunted by the huge crowd, while the band played an acoustic backing. The lyrics of “Different is OK” encourage meaningful connections and celebrating differences. The complete viral video of Huillo’s first Coldplay performance is below.