Minecraft wiki entry for Sounds.json, associated text: sounds.json (sound_definitions.json in Bedrock Edition) is a file used by the sound system in resource packs which tells the sound system what sound files to play when a sound event is triggered by one or more in-game events. This file is located in assets/minecraft in resource packs, and the default file is located in .minecraft/assets/objects (assets/resource_packs/vanilla/sounds on Bedrock Edition), and its hashed name can be found by looking it up in the file .minecraft/assets/indexes/<version>.json.