What large Berber confederation, principally inhabiting the Sahara desert, also has an annual festival showcasing their traditional music?
Tuareg people: The Tuareg people ( ; also spelled Twareg or Touareg; endonym "Kel Tamasheq", "Kel Tagelmust") are a large Berber ethnic confederation. Tuareg people:  They principally inhabit the Sahara desert, in a vast area stretching from far southwestern Libya to southern Algeria, Niger, Mali and Burkina Faso.
i don't know