RHY.10:4 - Solution

RHY.10:4.1 - Establish the reference the passage actually uses

Demonstrate or identify the recurring reference, entry and any larger grouping that matters. Specify through performance, notation or ordinary language which event or feature marks each needed landmark. A pulse, a cycle beginning and the accent of a phrase may occur together once and diverge later.

Make local references compatible where interaction requires it. One performer may count two equal divisions while another counts three over the same span. They need to recognize the relevant common landmarks; they need not use identical internal counting.

Use RHY.4 if the physical mark and the cue the performer receives disagree. Use RHY.9 if a necessary cue is unavailable during the passage.

RHY.10:4.2 - Distinguish placement, pace and grouping before correcting

Compare the intended relation with the received or performed one.

• A roughly constant displacement at an otherwise matching pace calls for a placement question.
• A displacement that accumulates across comparable events calls for a pace, period or changing-delay question.
• A correct local beat with a wrong entrance can call for cycle position or grouping.
• A missing response during sustained sound or silence can call for a continuing reference or an unresolved duration.

These are diagnostic contrasts, not exclusive causes. A changing cue delay can resemble a tempo error. An intended expressive displacement can resemble accidental lateness. Compare the relevant passage under a small useful change rather than infer a mechanism from one timestamp. When source pace and cue delivery remain plausible alternatives, compare source events with the received cues using an available independent reference or a suitable alternative cue channel. Obtain an additional timing observation only if that distinction changes the correction.

State the relation worth preserving: coincidence, a deliberate offset, alternation, shared phrase arrival or another recognizable coordination. The allowed variation comes from this use and the performing conditions.

RHY.10:4.3 - Choose how performers follow and adjust

Determine which information each performer uses for the current part of the passage. With a fixed recording, only the live performer can adjust that relationship. With mutually responsive partners, adjustments can be shared. Leadership may change at a phrase boundary or a signalled tempo change.

Make the arrangement understandable in practice: show the preparation, play or move the passage, and agree on the cue for a change where agreement is needed. Distinguish a cue announcing a new pace from a local expressive accent.

When corrections alternate or grow, compare a smaller correction, a clearer reference, or one temporarily stable contributor. Judge the combined response and retained phrasing. Do not assume that each performer correcting the full difference produces the fastest or most useful recovery.

A controller can implement explicit feedback gains. A performer may use learned adjustment without calculating them. Model parameters describe or prescribe a selected mechanism only under its assumptions; a fitted coefficient does not by itself identify the performer’s conscious rule.

RHY.10:4.4 - Preserve reference through gaps and plan a return

Carry the reference through rests, sustained actions and unarticulated beats when later entry depends on it. Available means include familiar internal continuation, visible or felt movement, a partner’s ongoing part, an appropriately timed cue or a duration-bearing representation.

Keep reference information distinct from what happens between landmarks. A gesture on each beat does not say whether a sound continues, stops or changes between them. Recover that content through RHY.5–RHY.6 when needed.

Choose a recognizable re-entry point if the reference is lost. A missing attack need not require restarting the entire performance. The return must be achievable with the available preparation; otherwise simplify, wait for a later agreed point or stop under the practice’s conditions.

RHY.10:4.5 - Try entry, continuation, change and recovery where needed

Use the relevant portion of the passage and the disturbances that matter to the current choice. A stable entry does not answer a tempo-change problem; an aligned ending does not answer an internal coordination problem.

Observe the intended relation along with the continuing sound, movement and partner task. Retain a correction that restores the useful relationship without losing them. If the performers understand the relationship but cannot enact it together, return the particular coordination need to RHY.11 or RHY.12.

Stop when the next performance or practice choice is supported. A local trial may be sufficient. Use RHY.14 for a stronger comparison and RHY.13 for a transfer or retention claim; neither is required merely to retain a familiar useful cue.

Reopen the affected reference, following relation or recovery when the partner, tempo, grouping, cue, equipment or support changes. Keep an unchanged sufficient part.