> It's just a glossary of singing terms, that if you sing at all you would know pretty much all of them. Not everyone studies theory. I sing in my church choir

> It's just a glossary of singing terms, that if you sing at all you would know pretty much all of them. Not everyone studies theory. I sing in my church choir but I had heard of almost none of these terms before. So don't underestimate the value of a glossary.