As a music theory expert, I can tell you that the concept of "B sharp" is indeed a part of the Western musical notation system. In music theory, the term "sharp" (denoted by the symbol "♯") is used to raise a note by a semitone. This means that if you were to play a B sharp, you would be playing a note that is one semitone higher than a standard B.

The reference to "B sharp" being another name for "C" is correct in the sense that in twelve-tone equal temperament, which is the most commonly used tuning system in Western music, B sharp and C are the same pitch. This is because the system divides the octave into twelve equal parts, and each semitone represents a half step up from the previous note. So, when you go from B to C, you are moving up by one of these equal parts.

However, it's important to note that the use of the term "B sharp" versus "C" can depend on the context within a piece of music. Musicians often use the term "B sharp" when they want to indicate a sharp (raised by a semitone) B, rather than simply moving to the next note, which is C. This can be particularly important in the key signature of a piece, where the presence of a B sharp would indicate that the key has five sharps, whereas starting with a C would suggest a different key signature entirely.

The mention of "black keys" refers to the physical keys on a piano. On a standard piano keyboard, black keys represent the sharps and flats of the white keys. There are no black keys between the white keys for B and C, which is why when you play a B sharp on a piano, you are essentially playing the key that would normally produce a C.

To summarize, "B sharp" is a valid musical notation that represents a note one semitone higher than B. It is enharmonically equivalent to "C," meaning they share the same pitch. The decision to notate a note as B sharp or C can affect the interpretation of the key and the overall musical context. And indeed, on a piano, pressing the key for B sharp will produce the same sound as pressing the key for C, as there are no black keys between them to represent a different pitch.

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Another name for B# is C, which has the same note pitch / sound, which means that the two note names are enharmonic to each other. It is called sharp because it is 1 half-tone(s) / semitone(s) up from the white note after which is is named - note B. ... There are no black keys between B# and B.read more >>