Intervallic expansion and compression

Intervallic expansion (and intervallic compression) is a kind of motivic variation.^{[citation needed]}

There are 3 options when using this technique:^{[citation needed]}

1. Expand/compress a single interval
2. Expand/compress multiple intervals
3. Expand/compress all intervals

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Belkin doesn't specify a "degree of similarity" category for this variation, as it's not mentioned by name, but each category could be applied¹:

• Changing a leap to be slightly larger is a close form variation.²
• Changing a step to a leap is a medium form variation.³
• Compressing an interval such that the following note is a repetition of the preceding note would be a distant form variation.⁴
  • In general, repeating notes that were not repeated previously is apparently a dramatic change.⁵

Perricone refers to this as "rhythmic retention / pitch change" since the rhythms are retained but some pitches are changed.⁶

Examples

Perricone