1. The tighter you close your eyes, the higher the pitch you can sing.
2. Holding your hand out in front of you increases your range.
In order to sing extremely high notes,
raise your hand higher; and for low notes, lower it.
3. To sing vibrato, some part of your body must vibrate.
Popular choices are eyebrows, eyelids, and hands (See rule 2).
Follow these rules, and you, too, will be a great singer in no time at all.