Because of their large range, overlap, and dynamic continuity,
strings can form unified masses or distinct layers.

Strings easily blend with themselves and with other families,

but they can also form clearly separate orchestral planes —

A group of strings may fuse into a single sonority,
or divide into separate musical entities.

In other words, strings naturally support
both perceptual integration and stratification.

(We’ll explore what these mean in a minute — don’t fret!)

Because the strings produce sound colors (timbres)
that can be so closely related, composers are free to
move fluidly between perceptual states.

Okay, wait, what?!
What do we mean by perceptual states,
and why are they essential to string scoring practices?

Cognitive psychology describes how the brain perceives sound:

We organize sound into concurrent streams of activity.

We are constantly interpreting what we hear;
grouping musical elements by similarity, proximity, etc.

Stratification occurs when sounds belong to different sources.

In the orchestra, differences in register, timbre, rhythm, or articulation
may cause us to separate sounds into distinct perceptual streams.

We then sense a coexistence of independent layers,

like: foreground, middleground, and background.

We can intentionally orchestrate stratification to build
contrast, structural hierarchy, etc.

Integration occurs when our brains group multiple sounds together
and hear them as belonging to the same source.

In the orchestra, similar pitch range, timbre, articulation,
and rhythmic timing encourage sounds to fuse together.

Instead of separate instruments, the listener
perceives a single composite sonority.

We can integrate for blend, mass, and timbral cohesion.

We can change the sound of the string section simply by altering:

how many string players are sounding at any given time.

This alters the section’s perceived:

• size
• presence
• tone color

Same notes — but different qualities entirely!

Changing the number of players doesn’t just change loudness —

It changes tone qualities within the section, like:

• how full it feels;
• how thin or dense it feels;
• whether we hear the strings in
  the foreground or background

What happens when we change the size of the string section?

In Koechlin’s view, “volume” is not the same as loudness:

Volume = the apparent size of a sound

how wide, spacious, or extensive it feels

Intensity = the strength or loudness of a sound

(Loudness and size, therefore, are different attributes.)

A sound can be:

• large but soft, meaning it can have both...
• ↑ high volume (size) and ↓ low intensity (loudness)
• or small but fierce / mighty...
• ↓ low volume (size) and ↑ high intensity (loudness)
• ...or somewhere in between!

To illustrate this, Koechlin considers celestial stars of varying density:

A flute in its low register can sound large and diffuse,
like a red giant — a large star with its matter spread out.

• ↑ high volume (size) and ↓ low intensity (loudness)

An oboe’s middle register can sound compact and concentrated,
like a white dwarf, with its mass compressed into a small space.

• ↓ low volume (size) and ↑ high intensity (loudness)

Transparent: ↑ high volume (large size) and ↓ low intensity

perception of — warm, diffuse, receding sound

Dense: ↓ low volume (small size) and ↑ high intensity

perception of — bright, compact, proximate, forward sound

Dense sounds tend to be heard in front.

Think: solo or small group expressive nuance

Transparent sounds tend to fall behind.

Think: section in unison, or a tutti chorus-like effect

Orchestration shapes perceived volume, intensity, and spatial presence,
creating a continuum from transparent to dense textures.

Some methods of distributing players across lines, managing volume & intensity:

Now, we can add 2 more lines to our table...