Duration

Chapter 20 — Part III, Groove: How Is Motion Organized in Time?

The Question

Why can two bass lines with identical attacks and pitches create different grooves?

The Mental Model

Duration is how long a note continues after its attack. Rhythm is not only a list of beginnings: every note also has an ending. A full-value note occupies the grid until the next attack; a shortened note releases early and leaves audible space.

Duration is distinct from attack placement. If two notes begin on beat 2 but one ends on the “and” while the other lasts to beat 3, their attack placement is identical and their duration differs. It is also distinct from touch: notation can specify a written length or articulation, but playback cannot reproduce every physical nuance of a bassist’s release.

A note’s release carries information the way its attack does — silence immediately after a note tells the ear that note is finished and something new is about to happen, while a note held into the next attack tells the ear the two events are connected. That’s why Panel B’s shortened notes don’t just sound “quieter” or “lighter”; they sound punctuated, each one a separate statement, where Panel A’s full values read as one continuous line. This chapter’s silences are still attached to a note that was actually played, though — a release, not an absence. Chapter 21 asks what happens when the bass omits an attack altogether, and the space itself, with no note preceding it, becomes the content.

The Microscope

The harmony, right hand, bass pitches, attacks, register, and tempo are identical. A gives every bass note its full quarter-note value. B shortens each to an eighth note and uses the remaining eighth as silence.

A — Full value. Each bass note continues until the next attack.

Two bars of quarter-note chord tones under sustained Cmaj7 and Am7 harmony.

X:1
T:Duration — full value
C:Alessandro Bessi
R:Concept study
M:4/4
L:1/8
Q:1/4=88
%%score { RH LH }
V:RH clef=treble name="Harmony"
V:LH clef=bass name="Bass"
K:C
[V:RH] "Cmaj7"[EGBc]8 | "Am7"[ACEG]8 |]
[V:LH] "^full value"C,2 E,2 G,2 B,2 | A,,2 C,2 E,2 G,2 |]

Listen

Use Bass only to confirm that both versions begin the same pitches on beats 1–4. Then use Full: the sustained harmony makes the gaps in B audible without stopping the harmonic context.

See

A fills each two-eighth-note beat with sound. B divides that same beat into one eighth note and one eighth rest. Nothing has moved earlier or later; only the release point has changed.

Play

Alternate full and shortened values without changing your attack grid.

Hold and Release. One attack pattern, four duration treatments.

A four-bar exercise moving from full values to shortened notes and back.

X:1
T:Hold and Release
C:Alessandro Bessi
R:Exercise
M:4/4
L:1/8
Q:1/4=88
%%score { RH LH }
V:RH clef=treble name="Harmony"
V:LH clef=bass name="Bass"
K:C
[V:RH] "Cmaj7"[EGBc]8 | "Am7"[ACEG]8 | "Dm7"[DFAC]8 | "G7"[DFGB]8 |]
[V:LH] "^full"C,2 E,2 G,2 B,2 | "^short"A,,1 z1 C,1 z1 E,1 z1 G,1 z1 | "^short"D,1 z1 F,1 z1 A,1 z1 C1 z1 | "^full"G,,2 B,,2 D,2 F,2 |]

Vary

Keep all four attacks in one bar. Lengthen only the final note so it continues into the next harmony. Does that ending connect the bars or blur the change?

The Music

“Afterimage” is an original eight-bar fusion ballad in 6/8. Its bass uses a recurring contrast between tones that linger and tones that release early. The right hand continues through the gaps, so every bass ending remains audible as a deliberate part of the groove.

Afterimage. Long and short releases shape an eight-bar phrase.

A restrained fusion study in 6/8 with sustained harmony and a monophonic bass duration motif.

X:1
T:Afterimage
C:Alessandro Bessi
R:Fusion ballad
M:6/8
L:1/8
Q:3/8=84
%%score { RH LH }
V:RH clef=treble name="Harmony"
V:LH clef=bass name="Bass"
K:C
[V:RH] "Cmaj9"[EGBd]6 | "Am9"[CEGB]6 | "Dm9"[FACe]6 | "G13"[FGBE]6 | "Cmaj9"[EGBd]6 | "Am9"[CEGB]6 | "Dm9"[FACe]6 | "G13"[FGBE]4 "Cmaj9"[EGBd]2 |]
[V:LH] "^linger"C,3 G,2 z1 | "^release"A,,2 z1 E,2 z1 | "^linger"D,4 z2 | "^release"G,,2 z1 B,,2 z1 | "^linger"C,3 B,,2 z1 | "^release"A,,2 z1 E,2 z1 | "^linger"D,3 A,2 z1 | "^connect"G,,2 z1 B,,2 C1 |]

Reflection

In “Afterimage,” which bass endings create forward connection, and which create punctuation—even though the attack pattern remains sparse throughout?