SpookyMcMusicpack.zip is a release file of the Minecraft resource pack Halloween Ambient Musicpack, made for Minecraft 1.15.2. It was published on August 23, 2021 and is 90 MB in size. For the full description, screenshots and every other version, visit the Halloween Ambient Musicpack resource pack page.
How to install: Put the .zip into .minecraft/resourcepacks (do not extract it) and enable it under Options → Resource Packs.
