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It lies a diatonic semitone above A and a chromatic semitone below B, thus being enharmonic to A? although in some musical tunings, B? will have a different sounding pitch than A?. B-flat is also enharmonic to C.
When calculated in equal temperament with a reference of A above middle C as 440 Hz, the frequency of the B? above middle C is approximately 466.164 Hz. See pitch (music) for a discussion of historical variations in frequency.
In Germany, Russia, Poland and Scandinavia this pitch is designated B, with 'H' used to designate the B-natural (or enharmonically C?). Since the 1990s, B flat is often denoted Bb or "Bess" instead of B in Swedish music textbooks. Natural B is called B by Swedish jazz and pop musicians, but still denoted H in classical music. See B (musical note) for an explanation.
|Scientific designation||Helmholtz designation||Bilinear music notation||Octave name||Frequency (Hz)|
|B?-1||B? or B? or BBBB?||(-uB?)||Subsubcontra||14.568|
|B?0||B? or B? or BBB?||(-vB?)||Subcontra||29.135|
|B?1||B?? or ?B? or BB?||(-wB?)||Contra||58.270|