i take singin' lessons use a keyboard or guitar and go up the notes (go up the lower notes first so as not to strain you voice) find the note you can't reach and go for it. do at least ten mninute a day and you should find your vocla range increasing. also most classical singin teachers will tell you to sing from the gut or chest ignore this, use your head voice it's just as good. axl rose and freddy mercury both sing in head voice