Voicing of F# Dominant 7

Rooted I

Back to F#7

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Left hand
F#3A#3C#4E4
Family
4-Note Rooted

The Rooted I voicing of F#7 stacks F#, A#, C# and E from the bottom up: the root, major 3rd, 5th and minor 7th of the chord.

It's one of the 4-Note Rooted voicings: four-note voicings with the root on the bottom or inside, in the left hand. The other for F#7 is Rooted II.