A♯ (musical note)
A , or la dièse, is the eleventh semitone of the solfege. In some countries it is informally called B.
This note lies a chromatic semitone above A and a diatonic semitone below B, thus being enharmonic to si bémol or B.
When calculated in equal temperament with a reference of A above middle C as 440 Hz, the frequency of the A above middle C is approximately 466.164 Hz. See pitch for a discussion of historical variations in frequency.Scales
- A Major: A B C D E F G A
- A Natural Minor: A B C D E F G A
- A Harmonic Minor: A B C D E F G A
- A Melodic Minor Ascending: A B C D E F G A
- A Melodic Minor Descending: A G F E D C B A
- A Ionian: A B C D E F G A
- A Dorian: A B C D E F G A
- A Phrygian: A B C D E F G A
- A Lydian: A B C D E F G A
- A Mixolydian: A B C D E F G A
- A Aeolian: A B C D E F G A
- A Locrian: A B C D E F G A
- A Ascending Melodic Minor: A B C D E F G A
- A Dorian ♭2: A B C D E F G A
- A Lydian Augmented: A B C D E F G A
- A Lydian Dominant: A B C D E F G A
- A Mixolydian ♭6: A B C D E F G A
- A Locrian ♮2: A B C D E F G A
- A Altered: A B C D E F G A
