Before pitch-shifting rewired how we hear music, there was something even more fundamental being manipulated: space itself. This episode traces reverb from the actual stone chambers and stairwells that early engineers dragged microphones into, through the golden-age obsession with echo chambers, the plate reverb units that defined Motown and Phil Spector's Wall of Sound, the digital reverb box that accidentally homogenized the entire sound of the 1980s, and the modern producers who are weaponizing room acoustics in ways that would make Sun Records engineers weep with jealousy. The place a sound seems to exist shapes how it feels in your chest — and somebody decided that place was negotiable.