Besides Blackpool has David ever been in any other 音乐剧 and can he really sing?

I'm not exactly sure about this, although he "spoofs" 唱歌 in DWConfidential at times, and he's done several stage productions, so I assume, he CAN sing, just probably all the other 音乐剧 he's done have been onstage.

Whenever I hear David sing, he's not actually too bad.