Hey again, I'm just curious to know your opinions and thoughts to my question:

What scale/technique should I use in order to create some medieval-sounding folk/Celtic/Finnish Humpaa folk melodies?
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Droning strings tend to also be big in folk music, no matter where you are in the world.

So maybe try some alt tunings that have some crazy chords that you could include droning strings in.
The major scale.
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