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+# Utilities for working with notes and scales
+
+# A minor scale goes up two fifths and down four from the root
+minor ← ∧12|7×2-↕7
+
+# Transpose frequency 𝕩 up 𝕨 semitones.
+Trans ⇐ (2 ⋆ ÷⟜12)⊸×
+
+# Frequency from note in roughly scientific pitch notation
+# e.g. C#, A4, Gb2, F##
+Oct ← ⊑'4'-˜('0'⊸≤∧≤⟜'9')⊸/∾"3"˙  # Default to 3 to hit middle C
+Note ⇐ (minor⊑˜'a'(⊢-≤◶'A'‿⊣)⊑) (+´⟜(-˝"#b"=⌜⊢) Trans 440×2⋆Oct∘⊢) 1⊸↓