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I'm training a music that is most on the G Major scale.. But then there's a B chord. As B is not on the G Major scale, how can I refer to it when I'm writing the chord progression?

EDIT

My guess is that I should just write a III instead of a iii that would be the normal case. But what about when I must refer to an F? G Maior scale only has a F#m7/5-, how can I refer to an F?

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    A B chord in G major would most likely be the dominant of the relative minor, Em, and therefore written V/vi. Is the B chord followed by an Em chord? Or even a C chord, for a deceptive progression?
    – MarioAran
    Jul 24, 2011 at 6:35
  • What do you mean "B is not on the G Major scale"? G major scale goes G, A, B, C, D, E, F#. I definitely see a B there!
    – Mr. Boy
    Nov 28, 2014 at 10:20
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    @Mr.Boy He's talking about a B major chord which does not naturally occur in the G major scale.
    – Dom ♦
    Sep 29, 2015 at 19:40

1 Answer 1

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When writing down progressions in the roman numeral system, most of the time you'll simply be writing the chord relative to the tonal center.

Thus, in the examples you mention, a B chord would be III and an F chord will be a bVII. In the first case, you are altering the modality of a chord that is already in key (Bm to B). In the second instance, you're flattening the seventh-degree chord (F#) and playing it as a major (as in G mixolydian).

When substituting chords in this way, you will either be temporarily stepping out of key or the harmonic context may be modal-based instead of pure diatonic, so be prepared to alter the scale accordingly for single-note passages.

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