SUMMARY
The Muslim theologian Abu ?amid al-Ghazali (d. 1111) is one of the most often cited authors when it comes to "music and Islam." His “Book on the Etiquette of Listening and Ecstasy” (*Kitab Adab as-sama? wa-l-wajd*), translated into English more than a hundred years ago, is widely circulated among Muslims in the East and West, in Arabic and English, in print and on the internet. This paper re-examines the text against the background of Arab musical theory of the time when it was written, and analyses selected technical terms that allude to concepts rooted in Late Antique musical philosophy and become also tangible in the Qur?an. al-Ghazali recognises both aesthetic pleasure and the transformative power of sounds and gives guidance how to channel the hearing perception into a salvific experience.