Julie Fowlis while a great singer was originally known for her whistle playing. This video shows why, at about the four minute mark. Such precision yet with variation. I am wondering if her whistle playing didn’t lead to her singing style which is also incredibly precise.
Towards the end when she’s doing that really complex fingering..holy crap.
Like a lot of great musicians, she gets “impossible” notes out of her instrument – that is to say, she makes it produce notes that it normally could not in the standard course of playing by using mouth resonance and the like, which is needless to say extremely difficult.