Grace VanderWaal YouTube America's Got Talent
Ukulele-playing Grace VanderWaal performed an original composition that earned for her a standing ovation from the four judges of "America's Got Talent." YouTube/America's Got Talent

Singer-songwriter Grace VanderWaal has gotten the highest viewership on “America’s Got Talent” YouTube channel among the 21 semifinalists.

The 12-year-old singer-songwriter from New York performed her original composition “Beautiful Thing” during Tuesday’s live show aired from the Dolby Theatre in Hollywood. The ukulele-playing musician got a standing ovation from the panel of AGT judges for her act.

The YouTube video of VanderWaal’s quarter finals act has garnered 1.8 million views after only days since its online broadcast. The viewership record translates to an average of 900,000 daily views since the last AGT live show.

Touted by AGT judge Simon Cowell as the next Taylor Swift, VanderWaal earned the golden buzzer from Howie Mandel during her June 7 audition wherein she performed another original composition “I Don’t Know My Name.”

Also viral on YouTube, Tape Face’ quarterfinals act generated 5.9 million views since July 26. Sam Will’s mime act got 3.2 million views within a six-day period ending Aug. 1. (Click here for detailed story)

Meanwhile, 35-year-old Philadelphia Eagles long snapper Jon Dorenbos’ magic act has gotten 4.3 million views since he got voted through to the semifinals on July 29. The 35-year-old National Football League player earned 3 million views by Aug. 1.

Videos of singers Laura Bretan, 11, and Calysta Bevier, 16, also went viral on YouTube. Bretan’s quarterfinals act earned 1.9 million views since July 26 while Bevier’s performance got 1.1 million views since Aug. 2.

The mentalist couple Thommy and Amelie of The Clairvoyants recorded 4 million views of their mind blowing act since Aug. 2, while Rubic’s cube expert Steven Brundage followed with 1.8 million YouTube views since Aug. 2.

The 21 semifinalists will compete for the US$1 million cash prize and title of winning "America's Got Talent" season 11. (Click here for more detailed story)

WATCH: 12-year-old singing sensation Grace VanderWaal performs original composition