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- Left hand
- Bb2Eb3F3Bb3
- Family
- Triads
The Doubled Root voicing of Bbsus4 stacks Bb, Eb, F and Bb from the bottom up: the root, 4th, 5th and root of the chord.
It's one of the Triads voicings. The others for Bbsus4 are Root Inversion, 1st Inversion and 2nd Inversion.