See B (musical note) and Musical note#Note names and their history for explanations. These are three note chords or triads, but we can also form four note extended chords based on the B flat major scale. Therefore, the chords in the key of B flat are Bbmaj, Cmin, Dmin, Ebmaj, Fmaj, G maj and Adim. Natural B is called B by Swedish jazz and pop musicians, but still denoted H in classical music. To come up with these chords, we follow the sequence, major minor minor major major minor diminished. Since the 1990s, B-flat is often denoted Bb or "Bess" instead of B in Swedish music textbooks. In Germany, Russia, Poland and Scandinavia, this pitch is designated B, with 'H' used to designate the B- natural. While orchestras tune to an A provided by the oboist, wind ensembles usually tune to a B-flat provided by a tuba, horn, or clarinet.
See pitch (music) for a discussion of historical variations in frequency.
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. B-flat is also enharmonic to C (C-double flat). It lies a diatonic semitone above A and a chromatic semitone below B, thus being enharmonic to A ♯, even though in some musical tunings, B ♭ will have a different sounding pitch than A ♯.
B ♭ ( B-flat), or, in some European countries, B, is the eleventh step of the Western chromatic scale (starting from C).
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