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However, from C to C♯
is equal to 1 half step. From C♯
to D is another half step.
Two consecutive notes equal 1 half step.
Remember, two half steps equal 1 whole step. Therefore,
from F to G is a whole step. A to B is a whole step. Where
do you end up after 1 whole step up from B?
Since there are no black keys between B and C, from B to C
is a half step. We need one more half step to create a
whole step. One more half step up from C takes us to C♯
or D♭depending
upon the key (scale) that you are playing in.
  
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