B flat suspended fourth piano chord (Bbsus4)

Also written A#sus4 (A sharp suspended fourth)

In a sus4 chord, the third is replaced by the fourth. Its tension naturally resolves to the major chord: a very common move in pop and rock.

On the keyboard

Chord notes

NoteInterval
B♭ (B flat)root
E♭ (E flat)perfect fourth
Fperfect fifth

Formula: 1 – 4 – 5 · B♭ – E♭ – F

A progression with this chord

  1. B♭sus4Isus4
  2. B♭I

The suspended chord resolves to the major chord on the same root: you hear it in countless pop and rock intros.

Other B♭ chords

The same chord on other roots