Ursula M. Franklin's The Real World of Technology was published in 1989 and remains the most important book on technology to me. I can’t recommend it strongly enough.
Two delightful moments in music/technology from the beginning of this chapter: Hendrix playing the Star Spangled Banner and Basque twins playing a txalaparta:
1932 Cairo Congress
The most comprehensive writing in English on the Cairo Congress comes from musician/ethnomusicologist Ali Jihad Racy. All meeting note quotations come from his article “Historical Worldviews of Early Ethnomusicologists: An East-West Encounter in Cairo 1932.” (Ethnomusicology and Modern Music History. Stephen Blum et al., editors, University of Illinois Press, 1991.). See also his “Comparative Musicologists in the Field: Reflections on the Cairo Congress of Arab Music, 1932.” (In This Thing Called Music: Essays in Honor of Bruno Nettl, Victoria Levine and Philip Bohlman, editors. Rowman & Littlefield, 2015) and his book Making Music in the Arab World: The Culture and Artistry of Tarab (Cambridge University Press, 2003).
Virginia Danielson's Voice of Egypt: Umm Kulthum, Arabic Song, and Egyptian Society in the Twentieth Century. The latter contains reflections on the Congress itself as well as wider generational divide between Kulthum (representing tradition) and Mohamed Abdel Wahab (representing modernity).
Throughout the course of writing this book I was not able to gain access to the digitized archives of the Congress’s recordings, however various country’s groups have been compiled on CD.
Sufi Plug Ins
The project page for Sufi Plug Ins offers downloads and more information. This demonstration video lets you see and hear them in action. Next is a short video about Devotion, the plug-in inspired by my time with Hassan Wargui and his father Abdellah in Issafen, Morocco.
As for Hassan’s music, it is fantastic. He records under his own name and as Imanaren.
Last but not least: as part of the Sufi Plug Ins project, I brought my Nettle ensemble to Morocco, where we spent a week working with Hassan Wargui, learning each others song's and writing new ones together -- and using some of the Sufi Plug Ins along the way. This videos documents a free public concert we gave in Tangier's Souq Barra, the main square in the medina, right in front of the Cinémathèque de Tanger.