Google Inc. Chairman Eric Schmidt came to South Korea to meet executives at the biggest makers of Android smartphones – Samsung Electronics Co. and LG Electronics Co. – but wound up also getting a dance lesson from Psy, whose “Gangnam Style” video and song became an international hit through Google’s YouTube.

Psy (or Park Jae-sang as his parents called him) showed up at the company’s Seoul office as Mr. Schmidt conducted an all-hands videoconference for employees in Asia. Screams and cheers were heard on the speakers as Google employees reacted to his arrival.

He spoke with Mr. Schmidt about the viral effect of the “Gangnam Style” video. And then, he showed Mr. Schmidt how to do the now-famous horse-riding dance that became the signature image of the video. About a half-dozen Google employees joined in. (Google's Seoul office is in the heart of Gangnam, coincidentally.)

As of Thursday afternoon, Psy's "Gangnam Style" video is at 291 million views on YouTube since its release in mid-July. Psy returned to South Korea earlier this week after a promotional tour in the U.S.

At a news conference before the meeting, Mr. Schmidt described how Psy’s success is an example of how YouTube is being used for more than just young musicians who are trying to break into the business.