#1
Its kind of hard to search this. Was just wondering why in the F Major scale is the 4th considered Bflat instead of A Sharp.
And also
in Dflat Major, the 4th is considered Gflat. Why is this not F Sharp?
#2
You can only use the letters once per scale.

So in the F scale the "A" note is A, and the next note is Bb. It's not A# because "A" has already been used.

And in the Db major scale the "F" note is F and the next note is Gb. It's not F# because "F" has already been used.
And no, Guitar Hero will not help. Even on expert. Really.
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#3
thank you much. Its something ive been wondering for a while and Ive been trying to get into "why" while im learning.