VOA慢速英语:Global Hip-Hop Music with a Message

do sing。do+动词原形表示对动作的强调

2.Andreas Hwang, also called Young Kin, told VOA that he is at ease with performing or singing songs that include political and social issues. 

at ease with对……感到轻松

at ease安逸,自在,无拘束,高枕无忧

例句：Put the soldiers at ease while waiting for inspection.
      等待检阅时让士兵们稍息。

      His state of mind was not at ease.
      他心绪不宁。

3.He said that if his musical career in China were to end, he could continue it somewhere else.

were to end是be to do的结构，表示将来

be about to, be going to, be to do

be about to表最近的将来，后面不接时间状语，be going to 侧重打算，想法，
be to do侧重意志，计划，安排I'm to meet him.(含双方事先约好的意思)