Acoustic scientists discovered that 3,000-year-old conch shells used as trumpets make a haunting and droning sound. Trumpets made of metal, such as bronze and silver, produce a buzzing vibration occurring inside the instrument. They date back to 1500 B.C.
Trumpets are brass instruments with the highest register. They are played by blowing air through mostly closed lips into the instrument's brass tubing. Trumpeters can create a variety of sounds by manipulating their lips or tongues while playing or by humming or singing while playing. These manipulations produce different growling sounds or varieties of tremulos. Clicking, breathing and hissing into the trumpet's tubing produce sounds that do not sound like a musical instrument.