Season 19 of “America’s Got Talent” is only six weeks old, but already we have a clear front-runner on the viral audition front. Singing janitor Richard Goodall appeared on the May 28 season premiere and has since racked up 18 million views on the official “AGT” YouTube channel (plus millions more across social media), more than any other act this year. In fact, no one else even comes close. Re-watch the emotional video above, which ends with Heidi Klum anointing Richard with her Golden Buzzer.

The audition began with the 55-year-old from Indiana telling judges Heidi, Simon Cowell, Sofia Vergara and Howie Mandel about his life-long dreams of becoming a singer. In order to make money, he took a janitorial job at an elementary school, seeing himself as “not a fancy person.” When his students heard him singing in the school halls, they encouraged him to try out for NBC’s reality TV...