Intervallic expansion and compression
Intervallic expansion (and intervallic compression) is a kind of motivic variation.
There are 3 options when using this technique:
- Expand/compress a single interval
- Expand/compress multiple intervals
- Expand/compress all intervals
belkin-2018 doesn’t specify a “degree of similarity” category for this variation, as it’s not mentioned by name, but each category could be applied
- Changing a leap to be slightly larger is a close form variation (p.5 par.4)
- Changing a step to a leap is a medium form variation (p.6 par.1, ch.1 fn.4)
- Compressing an interval such that the following note is a repetition of the preceding note would be a distant form variation (p.6 par.1)
- In general, repeating notes that were not repeated previously is apparently a dramatic change (ch.1 fn.5)
perricone-2000 refers to this as “rhythmic retention / pitch change” since the rhythms are retained but some pitches are changed.
Examples
#🔖 Perricone