According to Hoang Anh, a resident of Tan Binh District, Ho Chi Minh City, her husband has been doing his karaoke vocal training behind closed doors every evening. This implies that the needs for vocal training are on the rise, driving music schools to open karaoke training classes. According to Hoang Anh, a resident of Tan Binh District, Ho Chi Minh City, her husband has been doing his karaoke vocal training behind closed doors every evening. This implies that the needs for vocal training are on the rise, driving music schools to open karaoke training classes. “Teaching vocal training lessons is a skill.