brass
Brass instrument is a musical instrument that produce 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, literally meaning "lip-vibrated instruments".
woodwind
Wood wind instrument 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 scrap by a beater.
string
String instrument are musical instrument that produce sound from vibrating strings
keyboard
A keyboard instrument is a musical instrument played using a keyboard