Watch a 10-year-old perform Spiritbox’s “Holy Roller” on America’s Got Talent
Coincidentally, the episode aired the same night Harper was invited to perform the song with the band.
Harper walked onstage, drawing comments about her cuteness from the judges. Shortly after, their faces twisted in shock as she began to sing.
All three judges gave Harper a "Yes," securing her position in the next round.
Harper also joined Spiritbox onstage at O2 Academy in London to reprise her performance alongside Courtney LaPlante.
Watch Harper on America's Got Talent and her performance with Spiritbox below.