SEDR(Supplementary Experimental Data Record) is an experimental underground radio broadcasting platform based within Chicago, Illinois USA. Founded on Earth during the heat of the pandemic in 2020, SEDR is an online database collecting and archiving human data through the lens of sound, conversation, art, and culture. All our broadcasts are free and open to the world. This will never change. We hope SEDR will be an accurate reflection of these particular moments in time and space. SEDR is 100% volunteer based and operates through a team of friends, collaborators, and contributors.