It all depends on how the progression is built - you have two options here:
If the chord changes are quick and you have a modal progression such as Am Dmaj (A dorian progression) you can use the A dorian mode over all the chords, making sure to emphasize the characteristic scale degree (F#) (remember our little discussion in the PM)
If each chord lasts for more bars and you have time, deploy a different mode over each chord - Am works well with A dorian and D major works well with D mixolydian as Marius suggested
Make sure to emphasize the characteristic scale degrees if possible (F# for A dorian and a combo between F# and C on the D major chord- as these are the maj3rd and b7 of the D Mixolydian mode)
Hope I didn't complicate it too much for ya, so let us know how it goes and we'll help further
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This post has been edited by Cosmin Lupu: May 17 2014, 08:26 AM