The Families of the Orchestra
Learn the orchestra's four main instrument families: strings, woodwind, brass and percussion. Use examples and clues about how players start vibrations to distinguish the families.
What a learner can do afterwards
- Name the four families and give two instruments in each
- Describe how examples start sound: bowed or plucked strings, air blown across an edge, a vibrating reed, buzzing lips, or a struck or shaken object
- Use a stated playing action to explain an instrument's family, including cases where instruments share a material or pitch
- Use stated pipe lengths and end conditions to choose the lower lowest note in controlled comparisons
1 · Read
You have read about instruments joining a song. An orchestra groups instruments into four main families: strings, woodwind, brass and percussion. Use clues about how players start vibrations. Pitch, loudness or material alone does not tell you the family.
Violin and cello belong to strings. Players bow or pluck a string to start its vibration. The double bass usually plays lower parts than the cello. Their ranges overlap, so both instruments can play some of the same pitches.
Flute and clarinet are woodwind. A flute uses air blown across an edge. A clarinet uses a vibrating reed, a thin flexible strip. Even a metal flute is woodwind. Trumpet and trombone are brass. Players buzz their lips into a mouthpiece. Both families use vibrating air but start the sound differently.
These words compare how the sounds begin.
Timpani and cymbals are percussion instruments that players strike. Other percussion instruments can be shaken or scraped. A struck metal cymbal belongs to percussion, not brass.
Pitch is how high or low a sound is. Vibrations are back-and-forth movements. Slower vibrations give lower pitches. For a fair comparison, change one feature and keep the others the same. Lengthening a vibrating string lowers its pitch when thickness and tension stay unchanged. For pipes of matching width and end conditions, at the same air temperature, a longer air column has a lower lowest note.
Compare two ideal straight pipes of equal length and width, at the same air temperature. One is open at both ends; one is closed at one end. The closed pipe has the lower lowest note. Real instruments also have shaped tubes, holes or mouthpieces.
Use how the vibration starts to distinguish families. Compare pitch only with other relevant features held the same.
Original lesson, questions and flashcards written for this dataset.
Four original readings written for this dataset. OpenStax and wikiHow records were consulted for factual comparison; their prose is not reproduced.
More to read
Compare pipes fairly
A pipe's length is one clue to its notes, but it is not the only feature that matters. Compare pipes with matching widths and end conditions, at the same air temperature. The longer air column has the lower lowest note.
Now hold length and width fixed and change an end condition. In the ideal straight-pipe model, a pipe closed at one end has a lower lowest note than one open at both ends.
These comparisons describe a model. Real instruments contain details such as tone holes, reeds, mouthpieces and changing tube shapes. A flute and a trumpet cannot be compared completely by measuring their outside lengths.
A low part is not a whole range
The cello and double bass are string instruments. A player can begin a sound by bowing or plucking a string. Their bodies help transfer the string's vibration to the surrounding air.
A double bass usually plays lower parts than a cello. Their ranges overlap, however. Hearing one shared pitch would not tell you which instrument played it.
For a controlled string comparison, keep thickness and tension unchanged. Increasing the vibrating length lowers the pitch. Body size alone is not enough to predict every note an instrument can play.
Check an instrument guess
Words such as bright, mellow and rounded describe impressions of sound. They do not identify an instrument on their own. Players can change the tone they produce, and different instruments can sound similar.
Compare a recording with a known example. Check the programme or ask the player what was used. If you can watch, look for the action that begins the sound.
A trumpet and trombone belong to brass because their players use buzzing lips. A flute belongs to woodwind even when its body is metal.
The air inside a pan pipe
A pan-pipe player blows across the upper openings of separate tubes. In a set with closed lower ends, each tube holds an air column between its opening and its closed end.
Compare two such tubes with matching widths, at the same air temperature. The longer air column gives the lower lowest note.
For a home investigation, ask an adult to prepare clean, smooth tubes and handle all cutting. The adult should check the edges. Keep loose plugs away from your mouth and listen at a comfortable volume.
2 · Watch
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Where it sits
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Optional connections
Where this leads
Jobs that lean on this skill. Follow one to see everything it is built on.
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