Do you feel like you can't sing high notes? Are you frustrated when your voice "cuts out," gets squeaky, or hurts when trying to sing them?Lack of upper range is something that plagues a lot of folks, especially in a world of pop music that sometimes values the "loudness" of a singer rather than a healthy quality of singing. What you may not know, however, is that there are 3 common causes of this issue that are very possible to fix! Too little breathSinging is basically vibrated air, so you need to make sure you've got a steady stream of…