Nusrat Fateh Ali Khan (October 13, 1948 – August 16, 1997), a world-renowned Pakistani musician, was primarily a singer of Qawwali, the devotional music of the Sufis (a mystical tradition within Islam). Considered one of the greatest singers ever recorded, he possessed a three-octave vocal range and could perform at a high level of intensity for several hours.Extending the 600-year old Qawwali tradition of his family, Nusrat Fateh Ali Khan is widely credited with introducing Sufi music to international audiences.