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.