B♭ Suspended 2nd Chord (Bbsus2, A#sus2) on Piano
The Bbsus2 chord (Bb suspended 2nd) is built from 3 notes: Bb – C – F. It is also written as A#sus2.
Play these notes on a MIDI keyboard, your computer keyboard, or the on-screen keys and ChordKeys will name the chord back to you.
Notes and intervals
| Note | Degree | Interval from Bb | Semitones |
|---|---|---|---|
| Bb | 1 | root | 0 |
| C | 2 | major 2nd | 2 |
| F | 5 | perfect 5th | 7 |
Inversions
Rearranging which note sits at the bottom gives you 3 playable voicings of the same chord. Inversions let you move between chords with less hand movement.
| Voicing | Notes | Bass note |
|---|---|---|
| Root position | Bb – C – F | Bb in the bass |
| 1st inversion | C – F – Bb | C in the bass |
| 2nd inversion | F – Bb – C | F in the bass |
How the suspended 2nd chord is built
Every suspended 2nd chord uses the same interval formula: 1 (0 semitones), 2 (2 semitones), 5 (7 semitones). Starting on Bb and applying that formula produces Bb, C, F. Learn the formula once and you can build a suspended 2nd chord on any of the twelve roots.
Keys that contain Bbsus2
Every note of Bbsus2 belongs to these keys, so it will sit naturally in a progression written in any of them.
Other chords on Bb
Suspended 2nd chords on other roots
Frequently asked questions
What notes are in a Bbsus2 chord?
A Bbsus2 chord contains the notes Bb, C, F. Those are the 1, 2, 5 degrees measured from the root note Bb.
How do you play Bbsus2 on piano?
Place your thumb on Bb, then add C and F above it. With a right hand in root position the common fingering is 1–3–5.
Is Bbsus2 the same as A#sus2?
Yes. Bbsus2 and A#sus2 are enharmonic equivalents — they sound identical and use the same piano keys. Which spelling you use depends on the key you are playing in.