Music theory video: Voice - the most important instrument in the world

"Many instruments have defined many musical movements over the years, but there's one that's played a pivotal role in almost every one: The human voice" - 12tone introduces his latest video. "The way a singer uses their voice is one of the clearest ways of shaping a musical identity. Despite its clear significance, though, or perhaps because of it, the voice is notoriously hard to analyze" - the music theorist tries anyway.