Health experts also believe that music is a mood-altering substances. Singing wherever is entertainment for themselves and make healthy.
A study also revealed humming to increase air flow between the sinus and nasal cavity that potentially prevent sinus infections.
News reported that the hum was effective for relieving pain in the sinuses. For sinus or cavity in the bone which was about nasal (nose) remain healthy and free of infection, required ventilation so that air can flow smoothly. The best way to keep air moving equipment that is to hum a tune.
If other times people bothered by humming your hobby, you may argue that you do for your health!