Vlad,
No you are comparing apples and oranges.
I’m absolutely not – I’m comparing Granny Smiths with Golden Delicious. That’s the point – morality is, if not an off-shoot of aesthetics, then a first cousin (as are various other codified group opinions, like language). You look at a picture for example and, at an instinctive level, you find it to be appealing or not. When asked
why you think one painting to be great art and another trite moreover you can make arguments that justify your gut feel (or sometimes that contradict it).
Now consider morality. You might find the sight of, say, someone being attacked in the street to be instinctively abhorrent – the “yuk” response – and that’s enough for a quick “that’s immoral” judgment. When asked
why street attacks are immoral moreover you could produce various arguments to justify your instinct about that. Sometimes though there could be an argument that causes you to override your instinct – say because the attacker was a policeman rugby tackling someone heading toward a school with a loaded gun.
Can you see now that aesthetics and morality are functionally the same thing, albeit with different objects? They’re a mix of the instinctive and (sometimes) the reasoned to justify or override the instinct.
I declare myself ignorant of the work involved and I am not promoting reason as a route through to the answer.
And yet in practice you’re forced to do just that. You might for example think the late Beethoven Quartets to be great art – they move you instinctively in a profound way, and (assuming you know anything about them) if asked you could justify that judgement with arguments about their composition. On the other hand, you (presumably) wouldn’t feel the same way about the Birdie Song and, if asked why not, you could support that opinion too with arguments about the derivative and uninteresting composition etc.
As I assume you don’t think there’s a big book of deity-inspired rules about what is and isn’t good art or music to tell you what to dis/like, if you couldn’t support your instincts about these things with arguments then that’s all you’d have – instincts.
And the problem with that would be that would be that the only rational response from someone who didn’t happen to share those instincts would be a “so what”. When you have reason at your back though, then you can say “I think you ought to agree with me that murder is wrong/Beethoven was a great composer, and here’s why.” Note though that in neither case would there be an argument for objective truth, so there's no question of claiming to bridge the ought/is gap that such a claim would require.
You though have declared that reason is very much part of morality so what I ask from you should be no problem.
I have and it isn’t for the reasons I just set out. Nor though should it be a problem for you either if you think I ought to share your conviction that the Birdie Song is a magnificent work of art.