As a music theory expert, I can tell you that the concept of half steps and whole steps is fundamental to understanding the structure of music scales and intervals. In Western music, a half step, also known as a semitone, is the smallest interval between two adjacent notes on a chromatic scale. A whole step, or whole tone, is equivalent to two half steps.

When we talk about the distance between the notes B and B flat, we are referring to a specific interval within the chromatic scale. The chromatic scale is a sequence of all twelve pitches, each a semitone, or half step, above or below the starting pitch. This scale includes both the natural notes (A, B, C, D, E, F, G) and the accidentals (sharps and flats).

Now, let's address the specific interval between B and B flat. B flat (B♭) is a note that is a half step lower than B (B). This is because B flat is created by lowering the pitch of the note B by a semitone. In other words, there is exactly one half step between B and B flat.

It's important to note that the interval between B and B flat is not a whole step, as a whole step would involve moving up or down by two half steps. The example provided in the reference material seems to be discussing whole steps, not half steps. For instance, the interval between C and D is indeed a whole step because there are two half steps between these notes (C to C♯/D♭ and C♯/D♭ to D). Similarly, the interval between E and F sharp (E♯) is a whole step, as is the interval between G sharp (G♯) and A sharp (A♯), or A flat (A♭) and B flat (B♭), because in each case, you are moving by two half steps.

To summarize, the interval between B and B flat is a single half step, not a whole step. This is a basic yet crucial concept in music theory that helps musicians understand the relationships between notes and how they function within a scale or melody.

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If you go up or down two half steps from one note to another, then those notes are a whole step, or whole tone apart. Three whole step intervals: between C and D; between E and F sharp; and between G sharp and A sharp (or A flat and B flat).read more >>