A# Major Scale

The A-sharp major scale is a seven-note scale that consists of the following notes:

A♯, B♯, Cx (C double sharp), D♯, E♯, F♯, Gx (G double sharp)

Steps to build an A-sharp major scale:
Start on A♯.
Whole step up to B♯.
Whole step up to Cx (C double sharp).
Half step up to D♯.
Whole step up to E♯.
Whole step up to F♯.
Whole step up to Gx (G double sharp).
Finally, a half step up back to A♯.


The notes are given in the A♯ Major Scale:
A♯ (root)
B♯ (major 2nd)
Cx (major 3rd)
D♯ (perfect 4th)
E♯ (perfect 5th)
F♯ (major 6th)
Gx (major 7th)

The reason you see double sharps (Cx and Gx) is due to the rule of maintaining the pattern of whole and half steps in the major scale. For example:
The interval between C and D is a whole step, so in the key of A♯ major, C has to be raised by a whole step from C to Cx.
Similarly, the interval between F and G is a whole step, so G is raised by a whole step to Gx.

A#(Sharp) major scale have 4 sharps: F♯, Cx, Gx, and D♯.