A-sharp Minor

What it means

A-sharp minor is the minor key with seven sharps in its key signature: F♯, C♯, G♯, D♯, A♯, E♯, and B♯. Its tonic is A♯, and its relative major is C♯ major, sharing the same key signature. On the circle of fifths it sits seven steps into the sharp side, making it the theoretically most remote minor key in that direction.

Musical use

As in all minor keys, the key signature only indicates the pitch material of the natural form. The leading tone is created by raising the seventh scale degree and appears as an accidental within the bar — here that means G double sharp, since G♯ is already in the signature. Such double sharps are a routine part of every cadence in this key.

In the melodic minor form, the raised sixth degree is added going upward, requiring a further double sharp, here on F.

Enharmonically equivalent would be the spelling B-flat minor with five flats; in practice, this simpler enharmonic spelling is used almost exclusively. A-sharp minor itself appears in written music practically only as a brief, theoretical way station, for instance within chromatic modulation chains or in textbooks illustrating the circle of fifths.

Performance practice

Since A-sharp minor is rarely notated as an independent home key in practice, you are most likely to meet it while studying the circle of fifths or in brief chromatic transitions. In that case, work out the seven sharps and the additional double sharps of the leading tone deliberately rather than relying on the signature alone, and keep in mind that the same sound world is far easier to read in B-flat minor.