brass
Brass instruments is a musical instrument that produce sounds by sympathetic of air in a tubular resonator in sympathy with the vibration of the player's lips. Brass instruments are also called labrosones, literally meaning "lip-vibrated instruments.
woodwind
wood wind instruments are a family of musical instrument within the more general category of wind instrument
percussion
percussion instrument is a musical instrument that is sound by begin struck or scrapy by a beater.
string
string instruments are musical instruments that produce sound form vibrating strings.
keyboard
A keyboard instrument is a musical instrument played using a keyboard .