Prepare for the K-Popcalypse! What once seemed just a fad refuses to fade away. As everyone knows by now, the gangbuster success of Psy’s “Gangnam Style,” the most-watched music video in the history of the planet, catapulted South Korean pop — K-pop for short — onto the global stage. Dominant across Asia for more than a decade, K-pop has gained legions of new fans in Europe, Latin America, and points farther afield, fueled by the more than  two billion viewers who got a thrill watching Psy horsing around in his psychedelic romp.

Here in the United States, K-pop has been slower to make inroads, but distinct signs point to its growing popularity. For the first time, headliner K-pop bands are now mounting American tours and earning invites to Austin’s SXSW and other prestigious music festivals.

Not since the British Invasion of the 1960s has a national pop movement so bedazzled the world. What’s behind K-pop’s appeal, allowing it to supersede cultural obstacles and language barriers? Many fans cite the splashy videos – surreal, colorful affairs in the vein of “Gangnam Style” that boast lavish production values as conceptually rich as Hollywood blockbusters and that push the outer limits of sensory overload. The bands themselves are hardly slouches. Members work their buns off, practicing how to sing in unison and move in sync with one other, often from a tender age, when they can be weaned from their families and enrolled in a performing regimen as demanding as any martial arts training.