I think all you really have to do is learn or reference the chords for the key and mode you want to use.

For example D Dorian is from C Major scale. So in D Dorian your tonic i chord is D minor. From there you just climb the C major scale for your chords. So your dominant fifth chord is v A minor and your seventh chord is VII C major. All the chords don't necessarily work well in each mode. For example your sixth chord is now vi B diminished in D Dorian. But there are conventions of substituting parallel chords or foregoing the use of a particular chord depending upon which mode you are using.

A fabulous free resource is Hooktheory.com. Check out D Dorian here at https://hookpad.hooktheory.com/?idOfSong...e&tempo=120

I should add that Hooktheory will also easily show you the specific notes for the chord you are writing your melody over.

Last edited by DFT; 12/16/22 12:35 PM.
Help! I've fallen up and can't get down!