Tifa's Piano in a nutshell
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The only important thing that you have to know is Everytime when it says "PageUP + ..." means
👉👉👉 Hold PageUP and then add the second button to it 👈👈👈

Thats IT!

It's crazy cause there are so many guides on how to use the right keys on 360 controller, keyboard etc. but it's completely unclear for me why nobody just explain on how to push them correctly.

So the correct Sequence is
B
LB
X
Hold RB add X
Hold RB add LB
B
LB
X
Hold RB add B
A
B
LB
B

Same with the keyboard, ps1 and xbox controller, just dont forget to hold the PageUp Button.