people get nervous because sometime a small sound to them is accurately very loud we all have different hearing!
The trick is to NOT be nervous... that will make you sound bad. Then you will get more nervous and the cycle will continue until the end of the song. Do not worry about impressing people, don't focus so much on hitting notes, and believe in your talent!
In your ears :)
cochlea
Checkmate - 1960 The Sound of Nervous Laughter 2-18 was released on: USA: 14 February 1962
Even at the stone age people uses drums and mammoth tusks as thrumpets.
The purr of a nervous cat is often louder and somewhat jagged. It sounds anxious, which is a giveaway as to how the cat is feeling.
Longtime listening to sound levels more than 85 dBSPL hurts. 120 dBSPL is considered painful by most people.
Granddaddy Long Legs do no make a sound that people can hear they are small and feather light. They are one of the most poisonous spiders there is thankfully their mouths are to small to harm humans.
It used to be so people can get up for work.
The sound that is made by the Indian parrot is called a "squawk". The Indian parrots can be trained to speak to people.
nervous system
movement of the perilymph in the cochlear duct