The add9 trick on minor chords. Arpeggiate it and the 9 rubs a half step against the b3 (a whole step above the root) — the glass-and-neon sound of every new-wave verse you've ever loved.
movesnothing resolves — a 9 rings a half step under the minor 3rd and shimmerssolo·singland on the 9 over the minor chord; it stings in the best wayon recordMessage in a Bottle — The Police (the climbing madd9 arpeggios)try itArpeggiate your 6- as 6-add9, low string to high, and let everything ring.