Adds new sounds and textures that make Minecraft resemble Half-Life. Obviously, if you don't like the custom sounds, delete the sounds folder (same applies to the textures).
As far as I know, the file is compatible with 1.12, 1.13, and 1.14(Probably works with 1.15 and 1.16 too, idk).
Sounds and music from Half-Life, Half-Life 2, and Portal. All rights go to ValvE and their original composers.