Helicotrema is a non-profit festival curated by Blauer Hase and Giulia Morucchio. Started in 2012, it presents a program of recorded audio pieces, with the aim of investigating the possibilities of an environment and a form of collective listening, as happened in the first decades of radio broadcasting. The festival is structured in a series of listening sessions, in which the audience is invited to immerse themselves in listening to compositions by international authors. Over the years the festival has been hosted in very different places, always investigating how audio works, space and audience can merge together. The book is designed as a retrospective manual/manifesto, an extended reading of playing with sound, narratives, authors, spaces, public, and listening dramaturgy. Helicotrema commissioned Marcos Lutyens a new sound work to be featured in a Flexi disc as part of the publication.