Altered scale on French Horn
All four altered tensions — ♭9 ♯9 ♯11 ♭13 — over a dominant 7th. The 7th mode of melodic minor.
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Altered on other instruments
All four altered tensions — ♭9 ♯9 ♯11 ♭13 — over a dominant 7th. The 7th mode of melodic minor.