6/4 chords, also known as second inversion chords, are chords where either the fifth or bass note is placed above its usual position. They are often used for specific harmonic progressions and have a distinct sound.
Related terms
Root position chord: A root position chord is a triad or seventh chord where the root note is in the bass.
First inversion chord: A first inversion chord occurs when the third of the chord becomes the lowest note instead of the root.
Third inversion chord: A third inversion chord happens when both the fifth and seventh notes are inverted, resulting in an intervallic structure where there's now two thirds stacked on top.
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