You can make music by hitting things. 

You can make music by hitting or scraping things. 


Percussion instruments make sound when you hit or scrape them. 

There are many ways to group these tools. Some are called membranophones. These have a skin or head that you strike. Examples include the snare drum and the timpani. 
Musicians can be very creative. Some use a standard drum kit. Others use unusual things. A composer might use a metal anvil or a bucket. Some even use a siren! 
Percussion instruments are tools used to make music by being struck, scraped, or rubbed. 


There are many different ways that these instruments make their sounds. Scientists often group them into four main categories based on how they work. Idiophones are instruments that vibrate through their entire body, like bells or a xylophone. 
History tells us that percussion instruments might be the oldest musical tools ever made. 
Percussionists use many specific tools and instruments to perform their art. Some instruments have a definite pitch, meaning they play specific musical notes. 

Musicians are incredibly creative and can find music in almost anything. 

Percussion instruments are musical tools sounded by being struck, scraped, or rubbed. 
In the scientific field of organology, percussion is not a systematic classification. Instead, percussion instruments can belong to several different categories. The most common are idiophones and membranophones. Idiophones are instruments where the entire body vibrates to produce sound. 

Musicians also classify these instruments by their musical function. Some instruments have a definite pitch, meaning they play specific musical notes. 

Writing music for these instruments requires specific notation. For instruments with a definite pitch, composers use a musical staff. This staff uses the same treble and bass clefs used by many other instruments. However, instruments without a definite pitch use a specialist rhythm or percussion clef. In many cases, a bass clef is used as a substitute for a rhythm clef. This allows the percussionist to understand exactly when and how to strike the instrument. This precision is vital for keeping an ensemble in time.
Historically, the use of percussion in classical music has changed significantly. During the times of Haydn and Mozart, most orchestral pieces emphasized strings, woodwinds, and brass. Percussion like the timpani was included but used sparingly for accents. In the 18th and 19th centuries, instruments like the triangle or cymbals were also used rarely. The 20th century saw a major shift toward more frequent percussion use. 
Creativity in percussion extends to using unconventional or improvised objects. While many people think of the drum kit, percussionists use many other items. 

Today, percussion plays a pivotal role in almost every musical style. In military marching bands, the bass drum keeps soldiers in step. In jazz, the hi-hat or ride cymbal provides the essential swing rhythm. In modern pop, rock, hip-hop, and soul, a percussive beat is almost always present to keep the tune in time. Because there is such a huge variety of instruments, some large ensembles are composed entirely of percussion. These groups can represent rhythm, melody, and harmony all at once. 
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