Here's the stuff we found when you searched for "augmented fourth"

• The difference between tritone, augmented fourth, diminished fifth, #11 and b5
• Augmented 6th chord
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• Guide to Chord Formation : Diminished, Half Diminished, and Augmented Chords
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• The Art of Writing Translations: Fourth Chapter: On the Subject of the Holy Bible
• At work on the Fourth of July
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• Celebrating the Fourth of July through highly dangerous homemade explosives
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• Fourth Genoese War

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