Halveti-Jerrahi Meshk with Shaykh Muzaffer Effendi (1982) 

Halveti-Jerrahi Meshk with Shaykh Muzaffer Ozak (1916-1985), head of the Halveti-Jerrahi Order, November 8th, 1982, at the Masjid al-Farah on Mercer Street, New York City, during a visit to the United States with his dervishes. The video also features Shaykh Nur al-Jerrahi (Lex Hixon) (1941-1995), and Shaykha Fariha Fatimah al-Jerrahi (b. 1947).
Meshk, literally 'practice,' or 'exercise,' is work most often used by Turkish Sufis for learning and practicing devotional music, ilâhîs.
This video was taken by psychotherapist, Michael Kosacoff (1939-2020), a Qadiri-Rufai Sufi, and Halveti-Jerrahi muhibb of Shaykh Muzaffer Effendi. Prior to his passing, he made this video available to Pir Netanel Miles-Yépez of the Inayati-Maimuni Order for distribution on RU-vid.