It probably is C minor. It'll be easier to hear the song, though. Better labelled as Eb rather than D.
Last edited by mdc at Dec 29, 2012,
Cool cool! Another girl in MT.

Assuming that you mean G5...

The obvious place to go when looking at it is C minor. I disagree with this. It's G minor. My ear does not want to go back to C; it wants to go to G. C kind of works, but not nearly as well as G.

Really weird: I had on the Sonata Arctica song Victoria's Secret when I read this, and they use that exact progression in G minor. Perhaps that is influencing my opinion. I really go think that it's G minor, though.

Now that I've been playing it more, I can resolve to C just fine. If you really want to force it into C, play B notes instead of Bb notes when you play your melody over G5 (and just G5, at least for this trick).

My conclusion is that with no context, it is ambiguous.

(The trick is that in a minor key, the v chord is typically made into a major or dominant chord: V or V7. By playing B rather than Bb, you're implying that the chord is G rather than Gm, and the G major chord has a strong pull back to C, and it certainly doesn't imply G minor. You may recognize this as using the C harmonic or melodic minor scale. I see it as harmonic minor; someone else may have a compelling argument that it is melodic minor, and neither of us will be right or wrong. Anyway, the B note is less likely to sound good over the other chords, and it has nothing to do with this trick of implying the V chord.)

If that parenthetical paragraph doesn't make sense, please do ask questions.