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This mod has a bunch of different features revolving around Minecraft's soundtrack:
This mod can use and play any .ogg or .mp3 sound file! Customization of music is limited to your imagination.
1. Install any Forge client for a compatible version.
2. Put the Jar file in the Mods folder in your instance.
3. (OPTIONAL) Pre-make a music folder containing the .ogg or .mp3 sound files.

Music! is a versatile client-side mod designed to improve the immersion and auditory experience of Minecraft for both modpack developers and regular players.