Shawn Mendes

So Paradigm put up 11 more dates, in rooms from 1,800 to 2,600 capacity – places like the Ryman Auditorium, The Warfield and The Pageant. They sold out in a day.

“We moved up the room in Milwaukee,” Paradigm’s Matt Galle told Pollstar. “We moved from an 1,800-capacity room to 3,500. That’s the only one that isn’t totally sold out yet but it will be, in advance.”

As the 16-tear-old singer/songwriter from Canada tours the country with Taylor Swift, he is adding shows at the Greek Theatre in L.A. and other markets, including secondary and tertiary.

“The fans are coming out regardless of the market,” Galle said. Radio City Music Hall is anticipated for the fall, and the goal is arena shows in 2016.

This is for a so-called “YouTube star” that signed to a label last summer and dropped his first single, “Life of the Party,” in June.

“It was a big question mark to everyone,” manager Andrew Gertler told Pollstar. “We were confident but a lot of people see YouTube cover artists having difficulty in crossing over.  But, overnight, he sold 100,000 copies. He became the youngest artist to break into the Top 25 with a debut single – without any terrestrial radio. It was a wakeup call.”

Mendes’ demographic, if it isn’t obvious, is girls in the 12- to 16-year-old range, tethered to social media. It became clear when Mendes launched his album preorder during the Super Bowl and it became the No. 1 trend on Twitter.

“The people at Twitter were saying, ‘All these brands are spending millions of dollars to be the thing that goes viral during the Super Bowl, and here you have this kid doing something completely unrelated and surpassing all this crazy brand spending in the biggest-branded event of the year,” Gertler said. “It’s amazing to see the impact of new social media.”

Gertler said he tried to get a ticket to a Mendes show at the time and couldn’t.

“I was online to get tickets myself and couldn’t even add one to the shopping cart,” he said.