Scale Theory (cont.)
Now let's look at "E" (four sharps in the key signature -- it's getting hard now!!):

E = 1 or I
F# = 2 or ii
G# = 3 or iii
A = 4 or IV
B = 5 or V
C# = 6 or vi
D# = 7 or vii

The key of "B" gets a whopping five sharps in its signature:

B = 1 or I
C# = 2 or ii
D# = 3 or iii
E = 4 or IV
F# = 5 or V
G# = 6 or vi
A# = 7 or vii

That's the usual limit for scales, there are still more sharp scales, but only a masochist would want to play them. Actually, you should be aware of them and have the ability to work with them should they crop up in a tune down the road.
But all of this counting is not that necessary if you notice the relationship between note one and note 2 is always a whole step, and the between 3 and 4 is a half step. It's the relationship between the notes that is more important even than what its name is.

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