---
title: "String Family — AP Music Theory Definition & Exam Guide"
description: "The string family includes violin, viola, cello, bass, harp, and guitar. Learn to identify string timbres and ensembles like the string quartet for Topic 2.8."
canonical: "https://fiveable.me/ap-music-theory/key-terms/string-family"
type: "key-term"
subject: "AP Music Theory"
unit: "Unit 2"
---

# String Family — AP Music Theory Definition & Exam Guide

## Definition

In AP Music Theory, the string family is the instrumental group whose sound is produced by vibrating strings (violin, viola, cello, double bass, plus harp and guitar). You identify its timbre by ear and recognize string-based ensembles like the string quartet and string orchestra under Topic 2.8 (Timbre).

## What It Is

The string family is one of the main [instrumental families](/ap-music-theory/key-terms/instrumental-families "fv-autolink") you need to recognize by ear and by name in [AP Music Theory](/ap-music-theory "fv-autolink"). Its members produce sound through vibrating strings, usually bowed or plucked. The core orchestral strings, from highest to lowest, are violin, viola, cello, and double bass. Harp and guitar also belong to the family because their sound comes from strings, even though they're plucked rather than bowed and don't sit in the standard string section.

Each instrument in the family has its own **timbre**, the unique sound [quality](/ap-music-theory/unit-3/seventh-chord-inversions-figures/study-guide/lNdabGWeBDl9DMDQelld "fv-autolink") that comes from how the sound is produced (EK DES-2.A.1). Register matters too. A cello playing high in its range sounds different from a cello playing low, and a violin's low G string has a different color than its bright E string. The family also defines two standard performance media the CED names explicitly. A **string quartet** is two violins, viola, and cello. A **string orchestra** is a larger ensemble built from the orchestral strings, including double basses.

## Why It Matters

This term lives in **Topic 2.8 (Timbre)** in [Unit 2](/ap-music-theory/unit-2 "fv-autolink") and directly supports learning objective **2.8.A**, which asks you to identify performance media and instrumental timbres in performed music. The essential knowledge (DES-2.A.1) lists string orchestra and string quartet among the standard performance media you're expected to name on sight (or really, on hearing). Knowing the string family means knowing more than a list of instruments. You should know the pitch order within the family, which [clef](/ap-music-theory/key-terms/clef "fv-autolink") each instrument reads, what bowed versus plucked sound is like, and how register changes the sound quality. That's the difference between vaguely saying 'strings' and correctly identifying 'viola, the alto voice of the string family, playing in its middle register.'

## Connections

### [Instrumental families (Unit 2)](/ap-music-theory/key-terms/instrumental-families)

The string family is one branch of the larger family system that organizes instruments by how they make sound. The framework is simple. [Strings](/ap-music-theory/unit-2/timbre/study-guide/bsRxhsl3B7KFb5YgsYGW "fv-autolink") vibrate strings, winds vibrate air columns, percussion vibrates struck surfaces. Once you internalize that logic, identifying timbre on listening questions gets much faster.

### Timbre (Unit 2, Topic 2.8)

Timbre is the why behind the string family. A violin and a flute can play the exact same pitch, but the bowed string gives the violin its distinct color. Topic 2.8 is the hub where the string family, performance media, and [register](/ap-music-theory/key-terms/register "fv-autolink") all come together.

### [Percussion family (Unit 2)](/ap-music-theory/key-terms/percussion-family)

The [contrast](/ap-music-theory/unit-8/phrase-relationships/study-guide/diwcsRGh8jxcbua8l2BA "fv-autolink") case. Percussion instruments make sound by being struck or shaken, strings by being bowed or plucked. Comparing how sound is produced across families is exactly the reasoning EK DES-2.A.1 is built on.

### Clefs and pitch notation (Unit 1)

The string family is where clef knowledge from Unit 1 pays off. Violin reads treble clef, viola reads alto clef (it's the only standard orchestral instrument that primarily does), and cello and bass read bass clef. A question can test clefs and instrument identification at the same time.

## On the AP Exam

String family knowledge shows up in multiple-choice questions about timbre and performance media, often paired with audio. You might hear an excerpt and identify the instrument or ensemble, or answer a stem like 'Which orchestral string instrument reads primarily in the alto clef and serves as the alto voice of the string family?' (the answer is viola). Questions also test ensemble definitions, like recognizing what makes a string orchestra versus a string quartet or a brass quintet. No released FRQ asks you to define the string family directly, but timbre vocabulary makes your listening identification faster and your answers more precise across the aural portions of the exam. Know the four orchestral strings in pitch order, their clefs, and the standard string ensembles by exact instrumentation.

## string family vs String orchestra

The string family is a category of instruments (anything that produces sound through vibrating strings, including harp and guitar). A string orchestra is a specific performance medium, a large ensemble built from the orchestral strings only (violins, violas, cellos, double basses). So a guitar belongs to the string family but would never appear in a standard string orchestra. The exam treats 'string orchestra' as one of the named standard performance media in EK DES-2.A.1, while 'string family' is the broader timbre concept.

## Key Takeaways

- The string family produces sound through vibrating strings and includes violin, viola, cello, double bass, harp, and guitar.
- The orchestral strings in pitch order from highest to lowest are violin, viola, cello, and double bass.
- The viola is the alto voice of the string family and is the standard orchestral instrument that reads primarily in alto clef.
- A string quartet (two violins, viola, cello) and a string orchestra are standard performance media named in EK DES-2.A.1, and you should recognize both by ear and by instrumentation.
- Timbre depends on how sound is produced and what register is used, so the same string instrument can sound noticeably different high versus low in its range.
- This term supports learning objective 2.8.A, identifying performance media and instrumental timbres in performed music.

## FAQs

### What is the string family in AP Music Theory?

It's the instrumental family whose sound is produced by vibrating strings, including violin, viola, cello, double bass, harp, and guitar. It's tested in Topic 2.8 (Timbre), where you identify instrumental timbres and string-based ensembles by ear.

### Is the piano part of the string family?

No, not for AP purposes. Even though a piano has strings inside, its sound comes from hammers striking them, and the CED treats solo piano as its own standard performance medium rather than grouping it with the orchestral strings.

### What's the difference between a string quartet and a string orchestra?

A string quartet is exactly four players (two violins, viola, cello), while a string orchestra is a larger ensemble of violins, violas, cellos, and double basses. Both are standard performance media named in EK DES-2.A.1, and MCQs can ask you to identify either one.

### Which string instrument reads alto clef?

The viola. It serves as the alto voice of the string family, sitting between violin and cello, and it's the standard orchestral instrument that primarily uses alto clef. This is a common multiple-choice question.

### Do I need to identify string instruments by ear on the AP Music Theory exam?

Yes. Learning objective 2.8.A asks you to identify performance media and instrumental timbres in performed music, so you should be able to hear the difference between a violin and a cello, and recognize ensembles like a string quartet from an audio excerpt.

## Related Study Guides

- [2.8 Timbre](/ap-music-theory/unit-2/timbre/study-guide/bsRxhsl3B7KFb5YgsYGW)

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