Mr. NAVARRETTE: The criticism is that it's advancing a stereotype, but the brilliance of something like this is actually speaking a different language.

NPR: Barbershop: What's the Buzz?

It was like the city birds were speaking a different language.

BBC: Birds in cities 'singing louder'

"Whenever you come to a different country you have to integrate yourself with the culture and speaking the language is a very important part of that, " he said.

BBC: Sheraz Ahmed

Former U.S. Secretary of Defense William Perry, also a former negotiator with North Korea, told me this was a magic moment, with different peoples speaking the same language of music.

CNN: Behind the Scenes: Amanpour's notes from North Korea