Interleaving

A scale is an interleaving if it is (1) made of multiple copies (called strands) of a smaller scale and (2) any two copies of the smaller scale are interleaved so that any note of the first copy falls strictly between two adjacent notes of the other copy.

An interleaving is defined by the choice of strand scale and the choice of the offset chord that copies of the strand are placed on. For example, the ternary scale blackdye is an interleaving since it has strand pyth[5] and offset chord 9:10 or 5:9. A scale that is a union of multiple copies of a smaller scale s is an interleaving if and only if no interval of the offset chord (measured from a given root) falls between the smallest k-step of s and the largest k-step of s (inclusive) for any k, 1 ≤ k < size of s.