AP® Music Theory · Unit 2 · Topic 2.8
Timbre and Performing Media
Timbre is the tone color that lets you tell a violin from a flute even on the same pitch at the same volume. It comes from the unique mix of overtones each instrument stacks above its fundamental.
Every pitched sound is really a bundle of frequencies, not just one. The lowest, loudest frequency is the fundamental, and it's what you'd name as "the pitch." Stacked above it are overtones, also called harmonics, at whole-number multiples of that fundamental. A violin and a flute playing the same written note produce the same fundamental, but they excite the overtones above it in completely different proportions. The ear fuses all of that into one sound and reads the overtone mixture as tone color. That's timbre: not the pitch, not the volume, but the fingerprint of overtones riding on top.
The four orchestral families get their own characteristic timbres partly from how they're set into vibration and partly from their typical range. Strings (violin, viola, cello, double bass) use a bowed or plucked string and cover the widest total range, from the bass's low growl up to the violin's soaring top. Woodwinds (flute, clarinet, oboe, bassoon) vibrate a column of air, often with a reed, and sit in the middle-to-high range. Brass (trumpet, horn, trombone, tuba) buzz air through a mouthpiece into tubing, spanning low to high with a brighter, more metallic edge. Percussion covers everything struck or shaken, from definite-pitched timpani to indefinite-pitched snare drums.
This topic sits right after how many independent lines you hear in a texture, because timbre is what helps your ear separate those lines in the first place. A fugue's three voices stay distinct partly through contour and entries, but handing each voice to a different instrument color makes the separation obvious. Composers choose instrumentation knowing overtone mixtures either blend into one color or stay distinct, shaping how a texture is perceived.
Key terms
- Fundamental
- The lowest frequency in a tone, the one your ear identifies as its pitch.
- Harmonic (overtone)
- A frequency at a whole-number multiple of the fundamental that sounds above it.
- Timbre
- The tone color of a sound, produced by the specific mixture of overtones above the fundamental.
- Harmonic series
- The full sequence of harmonics, at 1x, 2x, 3x, and so on times the fundamental's frequency.
Watch it explained
- How it worksHow does the mix of overtones above a fundamental give an instrument its color?
- How it worksWalk me through the four orchestral families and where each one sits in range.
- Worked exampleFind the first six harmonics above a fundamental of C2 and name the interval each one adds.
- Going furtherWhat changes in a string's tone when the player moves the bow closer to the bridge?
Check yourself
End of topic.