How Can I Belt? When you sing a scale of notes, you should feel your voice change from low to high. Usually when you sing in your high voice, you're using your head voice. Usually when you sing in your low voice, you're using your chest voice. Although, there is one exception. When you push your chest voice to where your head voice should be singing is when you belt. This creates a sound that projects your voice. (Makes it louder). This could give you a great advantage in musical theater if you use it properly. For example, Idina Menzel played Elsa in Frozen and belts a lot in her famous song Frozen.