Mod MP3 Ultimate adds a craftable nine-slot music player to Minecraft 1.21.1.
Import an MP3, bind it to a reusable media card, and let nearby players hear
the same synchronized, positional audio. The player also accepts vanilla music
discs.

Features:

- synchronized spatial playback for players within a configurable 8–64 block
radius;
- play, pause, stop, previous, next, shuffle, repeat, volume, and queue
controls;
- nine media-card or vanilla-disc slots;
- persistent queue, settings, ownership, and playback position;
- owner/OP permissions plus optional public controls;
- rising-edge redstone play/pause and comparator levels 0/1/7/15;
- server-validated MP3 uploads with chunked transfer, resume support, SHA-256,
quotas, and a content-addressed client cache;
- optional JEI recipe and information integration;
- Polish and English interface.

The same mod file is required on the server and every connecting client.
Fabric API is required. JEI is optional.

Local imports never store a computer file path or URL on an item. Cards contain
only a media identifier, title, and duration. Audio is uploaded to the server
and cached by clients that need to hear it. The cache has no DRM and can be
copied.

The experimental YouTube importer requires tools supplied and configured by
the user (`yt-dlp` and FFmpeg). It must only be used with media the user owns or
that is in the public domain. It is not required for local MP3 playback.

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MP3 Ultimate Mod