For many styles of music, singers really want to have that “chest” sound throughout their entire vocal range. This is because “chest voice” has a certain powerful quality to it, that head voice does not. It is possible to maintain this “chest” sound into your upper vocal registers, with some special techniques of singing. When you want to get that “chest” voice sound higher in your range, it’s very tempting to “push” for it. And when you do this you immediately put strain on your voice, and your tone quality suffers badly. You need to learn and understand these techniques. Message me if you have any questions.