Pitched and unpitched percussion.
strings and nonstring instruments
Percussion instruments can be categorized into two main groups: pitched percussion and unpitched percussion. Pitched percussion instruments produce definite pitches, such as xylophones and marimbas, while unpitched percussion instruments produce indefinite pitches, such as drums and cymbals.
Percussion.
Percussion Woodwind Brass Strings I know I'm missing two but I'll update my answer as soon as I can.
Pitched percussion instruments produce specific musical notes, like xylophones and marimbas. Unpitched percussion instruments, such as cymbals and tambourines, do not produce specific pitches and are used for rhythm and texture in music.
string
The xylophone is an instrument which belongs to the percussion instrument.
There are four (4) groups of instruments: Strings, Woodwinds, Brass and Percussion.
Woodwind, brass, strings, percussion.
The two types of percussion instruments are pitched percussion and unpitched percussio n; pictch percussion produces a note and an audiable pitch, whereas unpitched percussion merely produces a note.
To narrow it down to three groups, it would be strings, winds, and percussion.