I have the progression

C G Am G D G 


C G A#sus2  E F G Am

So this is suppose to be in C major from what I know the D is a secondary dominant since it resolves to the G(I suppose), but the A#sus2 and the E major is strange to me. So whats the theory behind this and how to apply them?

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    @MatthewRead It's true that there aren't laws that dictate how chords can be used, but why do you think question is based on a premise that there are? He states some terminology that describes use of the D - isn't it fair to assume that he wants to know some terminology that could be used to describe the A#sus2 - E? (I do think the question could be clearer - e.g. if it included notation, or a link to a recording - but putting on hold as opinion-based doesn't seem to put us on a path gaining to that clarification) May 27, 2017 at 7:13
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    That A#sus 2 (probably better called Bbsus2) could be Fsus4, which brings it back into the 'key'.
    – Tim
    May 27, 2017 at 11:04
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    @MatthewRead - there are no laws; the OP is asking about theory, of which there's plenty.
    – Tim
    May 27, 2017 at 11:06
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    @MatthewRead Sorry for the inconvenience....what I wanted to know that if there's chord borrowing from a parallel mode or using secondary dominants...to what can we relate the A#sus2 or the E ? May 27, 2017 at 17:54
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    Though... if you ask specifically about ♭Ⅶ → Ⅲ... then this is not quite a duplicate. May 27, 2017 at 23:41

1 Answer 1


These two chords are Bb (bVII) and E (V/vi) in C major, so on the surface that doesn't make much sense, but let's take a detour:

The Neapolitan is the major chord at the bII position in a key, and it's a predominant chord that resolves to the dominant (V). This N - V resolution is very common in minor key classic music. E.g in E minor you might hear F/A - B7 - Em. The verse of this Schoolhouse Rock tune is i - N - V - i.

The relative minor of C is A minor, and it turns out, Bb and E is a fine N - V resolution in A minor! Now in both A minor and C major the E would typically resolve to Am, but V to bVI (E to F) is a very common deceptive cadence.

In general, squeezing in progressions from the relative minor (or other nearby keys) is a great way to spice up major key music.

  • That's a great observation, didn't occur to me! May 27, 2017 at 23:44
  • +1 This is exactly it, Steve! I wonder if you'd be interested in fleshing out this answer a little bit to make it more clear? Showing exactly what the Neapolitan and dominant are, and when they're "in" what key?
    – Richard
    May 28, 2017 at 0:10
  • There's something in this, although I don't think it addresses the question fully. The V/vi is all very well, but usually a secondary is followed by the target; not seeing that till 3 chords later.
    – Tim
    May 28, 2017 at 9:59
  • I prefer to think of it as a standard modal 'V--VI--VII--I' following the Neapolitan.
    – Richard
    May 28, 2017 at 13:03
  • @Richard See if my edit is an improvement
    – Steve Clay
    May 29, 2017 at 22:49

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