mixolydian scale
The Bagpipes has a range of nine notes, low G to high A.
The bagpipe scale is tuned close to but not exactly on the “concert bb” scale.
The traditional (western) scale is tone-tone-semitone-tone-tone-tone-semitone, with the octave divided almost evenly into 12 parts. The
Bagpipe scale is an octave (fairly) evenly divided into 8 parts. The tuning is close enough to the traditional scale that you can play along with a concert band, but be aware that your 7th (high g) is flat.
This is known as an mixolydian scale.