RHY.7:4 - Solution
RHY.7:4.1 - Name the difference the receiving choice needs
Identify the compared passages or specifications, the receiving activity and what the comparison can change. Examples include selecting an entrance cue, keeping an ornament within the available movement coordination, or choosing two contrasting exercises.
Replace an umbrella such as complexity with the property used here. Does it mean more distinct intervals, more displaced accents against a reference, harder recognition, more difficult execution, or greater reported interest? Several may matter; retain them separately.
Use sufficient existing RHY.2 content selections and RHY.5 representations directly.
RHY.7:4.2 - Make the rhythmic reference and allowed equivalences compatible
For onset-based patterns, state the cycle or passage length, origin, direction, time unit and event convention when these affect the answer. For continuous material, retain the trajectory or envelope feature being compared and its temporal reference.
Decide which differences may be ignored. A shape comparison may identify rotations; an entry comparison must retain phase. A comparison of relative durations may divide all intervals by the cycle length; a performance comparison must still retain actual tempo. Keep a normalized representation alongside the original if both questions remain live.
Where sources use different conventions, obtain the needed RHY.6 correspondence. Distinguish a specified silence from a span whose contents were not observed. Retain any permitted ornament that can change the compared property.
RHY.7:4.3 - Obtain the structural properties that can distinguish the alternatives
Select an operation appropriate to the question.
| Comparison question | Rhythmic operation | Information the result leaves open |
|---|---|---|
| Does the required event occur at the needed place? | Align ordered occurrences with the reference and compare their positions or intervals. | Sound quality, perceived timing and execution may still differ. |
| How do intervals repeat or vary? | Compute ordered successive intervals; summarize their counts only if order is irrelevant to the use. | An interval histogram omits order and cycle phase. |
| What interval relations occur anywhere in a cycle? | For each pair of onsets, compute the chosen directed or shorter circular separation, then compare the resulting relation or distribution. | Different arrangements can share a full interval distribution; the value alone leaves their perceptual effects open. |
| How does articulation relate to a metrical reference? | Locate attacks and continuations against the stated grouping or accent scheme; inspect the displacement or unarticulated reference positions used by the selected syncopation measure. | The measure’s value does not determine felt groove or difficulty in another metrical practice. |
| Does a continuous course meet a required rise, peak or release? | Align its relevant portions with the receiving reference; compare their time, extent or rate as the task requires, retaining any assumptions used between observations. | A compatible specified course does not establish how a performer or listener responds to its realization. |
| Does a performer have time to recover between assigned actions? | Map occurrences to the performing body part or mechanism; compare successive demands with its applicable recovery or coordination limits at the intended tempo. | A schedule compatible with supplied limits still needs the realization capabilities and conditions it assumes. |
Give the procedure behind a value. For a cyclic list of onset positions, successive gaps include the gap from the last onset to the first onset in the next cycle. Omitting that gap changes the structure. For a sum or histogram, retain the source sequence if later work needs distinctions the summary discards.
C.16 supplies general measurement interpretation; A.19.CPM supplies comparison under a declared rule. These general methods do not select the rhythmic feature. That selection comes from the receiving question and the operations above.
RHY.7:4.4 - Separate a structural result from a response or performance claim
Use actual observations when the question is how this performer or listener responds. Retain the task, preparation, tempo, cues and performing arrangement that make the comparison relevant. RHY.14 obtains and interprets such performance and response results; use a sufficient available result directly.
A structural contrast can suggest a trial without predicting its outcome. Do not rename a calculated entropy, a syncopation score or a classifier output as observed interest, transferable capability or aesthetic quality.
If the decision needs only an established difference in positions, no listener experiment is required. If a consequential uncertainty remains, choose an attainable comparison that could resolve it; its cost and displaced practice time are part of the choice under C.11.DUA.
RHY.7:4.5 - Return the comparison at its warranted scope
State which alternative has which relevant property, under the common basis. Keep trade-offs visible: one variant may offer clearer reference while another permits a wanted articulation. Preserve a trade-off instead of adding unlike scores to force a single winner.
Where a decision is now possible, C.11 selects among the available alternatives under the user’s preferences and constraints. The rhythmic comparison supplies its inputs. Where a new variant is needed, RHY.8 constructs one. Where a response matters but is still unknown, return that bounded question to RHY.14.
Stop with the comparison needed for the next move, or identify the one missing distinction preventing it. A broader ranking of all rhythms is a different and usually unnecessary claim. When the receiving decision or a condition supporting the comparison changes, reopen only the affected properties and retain unaffected results.