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So I have finished the A section of my waltz and am wanting to go to another key for the B section. The waltz is in the key of D major. So these chords are diatonic to it:

enter image description here

My melody in the A section ends on an F# as does the bass. This gives a sense that the section is finished but also that the key will change. Now, theoretically, there are 5 options to where to modulate to using that F#. But modulating to E minor I figured would be very unusual for a piece in D major without a previous modulation to G major. So that was out. This left me with 4 options. Those would be:

  • F# minor
  • G major
  • B minor
  • A major

The modulation to A major would be indirect. Modulating to iii I thought would be weird but it would be a common tone modulation because the note of F# is shared between the 2 keys. I have seen a ton of modulations to G major done via an F# rising to G. B minor would not be unusual at all, I would be doing a relative modulation there.

Someone else told me that because it harmonically makes sense, I should modulate to B minor. But why would this make more sense harmonically than say modulating to G major, the subdominant of D major, by raising the F# to G?

Here is my A section and the harmony I have in that section: enter image description here

So which of these 4 keys I listed should I modulate to for my B section?

closed as primarily opinion-based by David Bowling, ttw, Todd Wilcox, Dekkadeci, Tim Feb 3 at 10:13

Many good questions generate some degree of opinion based on expert experience, but answers to this question will tend to be almost entirely based on opinions, rather than facts, references, or specific expertise. If this question can be reworded to fit the rules in the help center, please edit the question.

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    Try all four and go with the one you like best. We certainly can't answer this question for you; it is subjective. – Todd Wilcox Feb 3 at 5:08
  • Hey, this section A doesn‘t end on F#, as your self have written D for the final chord, so you the root note will be D. On account to the waltz as such I could give you some feedback too, if you desire. You could ask: how far could this piece here considered as waltz? For the moment I would propose to you: listen to some waltzes by Strauss, Shostakovich - even Webern or Schönberg. There is more than just the 3/4 measure that is constituting the rhythm and the style of the waltz. – Albrecht Hügli Feb 3 at 8:37
  • Yes the root is D but when I said that the melody and the bass end on F#, I am talking about a note rather than a chord. – Caters Feb 3 at 15:25
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As the final chord of this section A is actually D:

your first section has the form of A-A'

you could continue now with section B in F#7 -> bm (and loop this phrase) and go back on the circle of 5ths (E7 -> A7) to the key of D. So section B would be a bridge leading to section A again.

Thus the whole section would have the schema: A-A-B-A.

This might finally be the section A

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