The percussion section is itself divided into three subsections:
- Tuned percussion, consisting of pitched instruments such as glockenspiel and tubular bells.
- Auxiliary percussion, consisting of all unpitched instruments such as snare drum and cymbals.
These three subsections reflect the three main skill areas that a percussionist studies.
Tuned percussion 
- See also untuned percussion
This subsection is traditionally called tuned percussion,  however the corresponding term untuned percussion is avoided in modern organology in favour of the term unpitched percussion, so the instruments of this subsection are similarly termed pitched percussion. All instruments of this subsection are pitched, and with the exception of the tympani, all pitched instruments of the percussion section are in this subsection.
- All mallet percussion instruments, and keyboard percussion instruments such as the xylophone and tubular bells.
- Collections of pitched instruments such as hand bells, tuned cowbells and crotales.
- Most other melodic percussion instruments.
Despite the name, keyboard percussion instruments do not have keyboards as such. Keyboard instruments such as the celesta and keyboard glockenspiel are not included in the percussion section owing to the very different skills required to play them, but instead are grouped in the keyboard section with instruments that require similar skills. Similarly, the timpani, although they are pitched percussion and are tuned by the player, are not included in the tuned percussion subsection owing to the particular skills expected of the player.
Auxiliary percussion 
All unpitched percussion instruments are grouped into the auxiliary percussion subsection, which includes an enormous variety of instruments, including drums, cymbals, bells, shakers, whistles and even found objects.
The timpanist is traditionally regarded as the principal of the percussion section. A high level of the skills unique to this instrument is expected.
While players of tuned and auxiliary percussion often play many instruments from both subsections during a performance or piece, the timpanist is normally dedicated to that instrument.
See also 
Other sections of the orchestra 
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