#1
I'm having tons of trouble here. Hopefully someone can help me out. Here's my dilemma:

I'm writing a song with these chords (in no particular order)

Dm (D F A)
Gm (G D A#)
A (A C# E)
Cm (C G D#)

I can't find the key signature that has those notes in it. I've looked through the circle of fifths and came up with nothing. Any ideas?
#2
well any key sig that has an A in it won't have an A#, or with a C won't have a C#, and so on. your best bet is to just put it in the key of your root chord, and use accidentals.

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Quote by Scumbag1792
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#3
C Dorian, with an A major chord thrown in for kicks.

The A major chord works because the Gm chord resolves well to A, and the A resolves well to Cm.

G -> A: D resolves to C#; Bb resolves to A.
A -> Cm: C# resolves to C; E resolves to Eb.

-SD
#4
So basically, it's the Bb major scale, right? That's what I thought originally, but the A major threw me.