Interleaving

A (k-)flought scale is a scale made of k > 1 copies (called strands) of an n-note scale, where any two copies are interleaved so that any note of the first copy falls between two notes of the other copy, and vice versa. The concept is a generalization of dipentatonic scales.

Blackdye, Zil[14], and bicycle are examples of flought scales, because they each have two interleaved strands, respectively Pyth[5], Zarlino, and 8:9:10:11:13:14. The terminology, however, is intended to cover any number of strands and any choice of strand scale.)