# A♯ Suspended 2nd piano chord (A♯sus2)

A♯sus2 contains A♯, B♯ and E♯. The third replaced by the second. A♯ is a black key; B♯ and E♯ are white.

- Canonical page: https://piano.org/chords/suspended-2nd/a-sharp/
- Entity: chord:sus2:a-sharp
- Notes: A♯ B♯ E♯
- Formula: 1 2 5
- Intervals from root: P1, M2, P5
- Interval stack (semitones): 2 5
- Also written: A♯sus2, A#sus2, A♯ suspended 2nd
- Parameters: A440, 12-TET, 165 mm octave, spans centre to centre

## Construction

| Degree | Note | Interval from root | Semitones |
| --- | --- | --- | --- |
| 1 | A♯ | Perfect unison | 0 |
| 2 | B♯ | Major second | 2 |
| 5 | E♯ | Perfect fifth | 7 |

## Fingering

Rest your right hand over the notes with finger 1 on A♯, finger 3 on B♯, finger 5 on E♯. The left hand mirrors it.
Right hand 1-3-5, left hand 5-3-1. Source: piano.org fingering method v1.

## Inversions

| Position | Bass | Notes in order | Figured bass | Span |
| --- | --- | --- | --- | --- |
| Root position | A♯ | A♯3 B♯4 E♯4 | 5/3 | 7 st, 96 mm |
| First inversion (A♯sus2/B♯) | B♯ | B♯4 E♯4 A♯4 | 6/3 | 10 st, 138 mm |
| Second inversion (A♯sus2/E♯) | E♯ | E♯4 A♯4 B♯5 | 6/4 | 7 st, 96 mm |

## Voicings (5)

| Voicing | Notes | Span | Relation | Omits or adds |
| --- | --- | --- | --- | --- |
| Close, root position | A♯3 B♯4 E♯4 | 7 st, 96 mm | identical | none |
| Close, first inversion | B♯4 E♯4 A♯4 | 10 st, 138 mm | identical | none |
| Close, second inversion | E♯4 A♯4 B♯5 | 7 st, 96 mm | identical | none |
| Open, fifth on top | A♯2 E♯3 B♯4 | 14 st, 193 mm | identical | none |
| Root and third only | A♯3 B♯4 | 2 st, 28 mm | subset | omits E♯ |

## One-edit neighbors

| Becomes | Edit | Changes | Common tones |
| --- | --- | --- | --- |
| A♯add9 | 1 3 5 9 | adds C× | 3 |
| A♯ | 1 3 5 | B♯ becomes C× | 2 |
| A♯m | 1 ♭3 5 | B♯ becomes C♯ | 2 |
| A♯sus4 | 1 4 5 | B♯ becomes D♯ | 2 |
| A♯maj7 | 1 3 5 7 | B♯ becomes C×, G× | 2 |
| A♯7 | 1 3 5 ♭7 | B♯ becomes C×, G♯ | 2 |
| A♯m7 | 1 ♭3 5 ♭7 | B♯ becomes C♯, G♯ | 2 |
| A♯mMaj7 | 1 ♭3 5 7 | B♯ becomes C♯, G× | 2 |
| A♯7sus4 | 1 4 5 ♭7 | B♯ becomes D♯, G♯ | 2 |
| A♯6 | 1 3 5 6 | B♯ becomes C×, F× | 2 |
| A♯m6 | 1 ♭3 5 6 | B♯ becomes C♯, F× | 2 |
| A♯dim | 1 ♭3 ♭5 | B♯, E♯ becomes C♯, E | 1 |

## Set theory

- Absolute pitch classes: {10, 0, 5}
- Relative pitch classes: [0, 2, 7]
- Normal order: [10, 0, 5]
- Prime form: (027)
- Forte number: 3-9
- Interval vector: <010020>

## Frequencies (close root position)

| Note | MIDI | Frequency |
| --- | --- | --- |
| A♯3 | 58 | 233.08 Hz |
| B♯4 | 60 | 261.63 Hz |
| E♯4 | 65 | 349.23 Hz |

## Questions and answers

### What notes are in A♯sus2?

A♯sus2 contains A♯, B♯ and E♯. The formula is 1, 2, 5.

### How do you play A♯sus2 on piano?

Play A♯, B♯ and E♯ together. Right hand fingers 1, 3, 5; left hand 5, 3, 1. A♯ is a black key; B♯ and E♯ are white.

### What are the inversions of A♯sus2?

3 positions: root position A♯ B♯ E♯, A♯sus2/B♯, A♯sus2/E♯.

### What is the difference between A♯sus2 and A♯add9?

Adds C×. 3 of the notes are shared.

### What is an easy A♯sus2 for small hands?

The root and third only voicing, A♯3 B♯4, spans 2 semitones or about 28 mm.

### What are the frequencies of A♯sus2?

From A♯3 at A440 in 12-TET: 233.08, 261.63, 349.23 Hz.

### What is the set class of A♯sus2?

Prime form (027), Forte 3-9, interval vector &lt;010020&gt;.

### How do I transpose A♯sus2 to another key?

Keep the 1, 2, 5 formula on the new root. Csus2 is C, D, G; C♯sus2 is C♯, D♯, G♯.

### Is B♭sus2 the same as A♯sus2?

Enharmonically yes: the same piano keys and the same sound, spelled differently.

## Provenance

Every derived value above is computed by the piano.org theory kernel from the root, the quality and the stated parameters. Nothing is hand-entered per chord.

Machine record: https://piano.org/api/knowledge/v1/entities/chord:sus2:a-sharp
Last reviewed: 2026-08-12