Question

what is brass instruments?​

Answer 1

brass instrument is a musical instrument that produces sound by sympathetic vibration of air in a tubular resonator in sympathy with the vibration of the player's lips. Brass instruments are also called labrosones or labrophones, from Latin and Greek elements meaning 'lip' and 'sound

Answer 2

Brass Instruments

$\implies$ Brass instruments usually made of brass or other metal are musical wind instruments in which the vibration of the player’s lips against a cup- or funnel-shaped mouthpiece causes the initial vibration of an air column. It should be precisely termed as lip-vibrated instrument.