Choosing a scale is the single highest-leverage harmonic decision — it sets mood before any chord is played

A scale is a chosen subset of the 12 chromatic notes expressed as a pattern of semitone steps. The tonic is degree 1; other degrees are numbered 2–7. Scale choice sets the emotional character of a track before a single chord is written. The seven diatonic modes each carry a different feel: Lydian (brightest, floating), Ionian/major (happy, resolved), Mixolydian (bright but bluesy), Dorian (minor but hopeful), Aeolian/natural minor (sad, serious), Phrygian (dark, exotic), Locrian (unstable). For live-coding composers the practical heuristic is: reason in scale degrees, resolve to pitch class late, so transposition is free.

Examples

A generator using scale degrees 1-2-3-5 sounds very different in Dorian vs Phrygian even with the same pattern. Strudel: .scale(‘c:dorian’) vs .scale(‘c:phrygian’).

Assessment

Name the scale/mode most appropriate for each mood: dark/hypnotic, euphoric, dreamy/ambient, minor but hopeful. Justify each choice by its characteristic interval.