That is commonly called a half step.
C sharp is equivalent to the note D flat.
The tonic is C sharp.
That would be C-sharp major. Every note is sharp.
No, the A is not the same as B sharp. B sharp would be the C note since there are no music notes between B and C. The C note would only be called a "B sharp" if C sharp is used in a key, since proper music note naming only allows for one note of each base name ("accidental" notes excluded). So rather than have two types of C notes, you would have a type of B note and a type of C note.
C sharp, D sharp, E natural, F sharp, G sharp, A natural, B sharp & C sharp We call the note C "B sharp" to avoid using the same letter name twice. If we used the note name "C" we would have 2 C-notes and no B-notes in the scale!
The E sharp is the F note. The interval between C sharp and F (e sharp) in two whole steps.
G#
F would be C quintuple sharp.
Well the white notes are normal notes c's, d's, e's, f's, g's, a's and b's. The black notes are sharp, the black note to the right of c is c sharp and so on
The musical term "B sharp" represents the note B which is the same as the note C.
A sharp raises a note by half a step, while a flat lowers a note by half a step on the piano. For example, if a note is played as C♯, it is one half step higher than C; if played as C♭, it is one half step lower than C.
C sharp