What is the difference between G♯ major and A♭ major? Why do they look different on sheet music?
For example, there is "𝄪♯♯♯♯♯♯♯♯" in G♯ major and "♭♭♭♭" in A♭ major. This is the symbol that looks like this on the score.
Why is there an extra double rising mark?
(The material comes from the Internet for image)