Dawla Nasheed Archive is a controversial collection of audio propaganda produced by the militant group ISIS (the Islamic State, or

But the archive grew restless. By 2017, as the territorial "caliphate" crumbled, the nasheeds took on a new life. They became ghostly anthems, circulating in encrypted chat groups, used in propaganda revival attempts, and studied by counter-terrorism analysts. Dr. Al-Hassan realized his academic collection had become a dangerous artifact—a library of incantations that could outlive the state that spawned them.