Citations
https://www.bbc.co.uk/programmes/articles/5Plm8bBlBd7wXjZN2zdb8Fm/a-beginners-guide-to-qawwali-music
https://www.britannica.com/art/qawwali
https://ums.org/2014/03/03/qawwali-more-familiar-than-you-think/
https://www.britannica.com/biography/Nusrat-Fateh-Ali-Khan#ref740312