From A Wiki of Ice and Fire
The bone flute is a musical instrument of the woodwind family. It is a type of flute made of bone, like paleolithic flutes.
A Dance with Dragons
One of Yurkhaz zo Yunzak's slaves plays a bone flute whilst the goat boy dances a grotesque jig at Yezzan zo Qaggaz's banquet for Yurkhaz.
- ↑ A Dance with Dragons, Chapter 47, Tyrion X.