I don’t think of it as ugly. It’s just what happens sometimes. Like if you start in G# minor and then use the leading tone. It’s way better to see F-double sharp than to see two different Gs fighting each other on the page. And it’s even worse to have to decipher those awful chromatic systems that are all painful to read.
Technically speaking that’s a Ab minor. New minor scales are constructed by modifying the A-minor scale (which contains the same flat notes as C-major) by adding Bs, not adding #’s. Adding #’s are used for deriving new major scales. At least that’s how I understand it.
You can see this on the Wikipedia article on various minor[1] and major scales[2].
G# minor is used all the time as the relative minor of B major (5 sharps in the key signature). Ab minor is the relative minor of Cb minor (7 flats) and thus is almost never used except perhaps in passing for a modulation.
> New minor scales are constructed by modifying the A-minor scale (which contains the same flat notes as C-major) by adding Bs, not adding #’s. Adding #’s are used for deriving new major scales.
No, a major scale can have both flats and sharps and the same for minor scales. In fact major scales often start on a flat while minor scales often start on a sharp. Major scales use Db Eb F# Gb Ab Bb as the roots of the scales (rarely C# and Cb), plus the white keys; while minor uses C# D# Eb F# G# Bb (rarely Ab and A#), plus the white keys.
> New minor scales are constructed by modifying the A-minor scale (which contains the same flat notes as C-major) by adding Bs, not adding #’s.
I think you're confusing two different ways of constructing the minor scales.
One way is to start with the A minor scale (which has no sharps or flats) and to go around the circle of fifths[1] adding sharps or flats. Whether you add sharps or flats depends on whether you're going clockwise or counter-clockwise: for example, D minor[2] (one step from A minor going counter-clockwise) has one flat, and E minor[3] (one step from A minor going clockwise) has one sharp.
Another way to construct a minor scale is to start with its parallel major[4] and add a flat to the 3rd, 6th, and 7th. But note that the result can still have sharps (like in the E example above, where E major has 4 sharps).
In any case, G# minor is definitely a key that is used[5].
Technically speaking, if they said it's G# it's G#.
G# minor is a much better use of the key signature system than Ab: 5 sharps versus 7 flats. In practical terms, that's a proxy for it being more common.
Your vision that minor scales are constructed from A minor is valid; thinking it's by adding flats exclusively is misguided.
I'm not going to go out on a limb and defend the fact that sharps-based minor scales could be more common than flat-based, as that's likely not the case. A much easier argument against your logic is that flats-based major scales are used all the time.
Any given key signature can be either major or minor, be it made of sharps or of flats. It can be seen as altering C major or A minor indeed, but the alteration is allowed to go either way.
> awful chromatic systems that are all painful to read
The worst ones are the ones that petulantly stick to some theoretically-correct framework and produce a mishmash of accidentals that are canceled on the next note. If it's ascending, add sharps (or cancel the flat) on the second note. Let the key signature do the work instead of making me read all that to discover it's a simple chromatic run.
Of course people use double-sharp keys. And like you said, it is usually done in cases where it is the simpler notation to describe what is happening musically.
Simplicity is beautiful and construction of the major key in E-flat is decidedly simpler than in D-sharp.
I don’t think of it as ugly. It’s just what happens sometimes. Like if you start in G# minor and then use the leading tone. It’s way better to see F-double sharp than to see two different Gs fighting each other on the page. And it’s even worse to have to decipher those awful chromatic systems that are all painful to read.