International audienceIn recent history, sound techniques of urban rituals in Cairo have had a series of innovations, wich consequences have, sometimes unintentionally, changed the sound environments, influenced musical aesthetics, and ultimately shaped a part of popular culture. The synthesizer, modified for Arabic music, takes an important part of the development of the sound tehnologies and it has become an important source of the diffusion of the new sounds, with the modes of amplification and transformation of the sounds.From codified exposition of city society to religious ceremonies in front of by the tombs of the saints, these rituals are qualified by a specific sound environment that can be identified by both those who acknowledge ...