NB: In the video (➺ below) the piper mentions an initial C, but when playing, it sounds, oddly, quite sharp (almost like a C♯) !; The g, a, and b are, however, clearly in common pitch!

c²-g¹-b¹-g¹-a¹ [➺ remark(s) above].
NB: Example(s) to be replaced with staff-notation.