They sure do like their karaoke in Vietnam. Here, instead of going to a bar full of people & singing in front of strangers, you rent a private room for an hour or two & sing in front of your friends. Most of the Vietnamese that I have heard sing karaoke do it quite well. It looks like they get tons of practice.
I went to karaoke bars both Saturday & Sunday night, both nights with gracious hosts. But I can only sing Copacabana so many times. Maybe I need to start expanding my repertoire.