[header] How to hum [title] Begin singing a note. [step] Open your mouth and begin vocalizing a certain note or pitch. Keep your lips parted slightly and your jaw, throat and diaphragm relaxed. 
You should feel the vibrations of the note originating at your vocal cords. [substeps] The only real difference between singing and humming is that when humming, the movements of the mouth are taken out of the equation.