
This is a bagpipe tune in CGCGCD tuning- also known as C sus2 as the tuning consists of roots and fifths with the stray second on top. The absence of the third in the open strings makes it very easy to flip from major to minor.
To me, this tune seems to be not obviously for the pipes and is played on many instruments- so rather than treat it as a pipe tune and worry about mimicking the drones etc. in this instance we de-couple the tune from its source and focus on melody and harmony. The tune flows over a simple descending chord pattern which is repeated with one change in the b part of the tune. We use the Csus2 tuning to get some good voicings for our arrangement and also exploit the whole tone step between the top two strings to play the "hook line" of the melody across three strings creating a harp-like effect.