The moon blocks the sun, creating a solar eclipse, as a familiar, unaccompanied voice belts out from the shadows and the spellbinding Raindrops (An Angel Cried) shimmers into gear. Hello from the Sweetener World Tour, Ariana Grande’s latest – and greatest – live show.

“This isn’t basic pop,” asserts Kelly Chappel, Live Nation’s EVP, European touring, with just a touch of understatement. “Ariana is authentic and she appeals to the masses. Her music is more mature so she has garnered ...