A custom music disc resource pack remaps the sound events that jukeboxes play for vanilla disc items such as Cat, 13, Pigstep, or Creator. You still craft, loot, or /give the normal disc items — only the audio file behind each disc changes while the pack is active.
This is ideal for SMP hubs, adventure maps, roleplay servers, YouTube worlds, and personal survival bases where you want custom lobby music, theme songs, or meme tracks without mods or datapacks for basic replacement discs.
MC Toolbox builds the pack entirely in your browser. Audio is prepared locally (OGG pass-through, or convert MP3/WAV/M4A/WebM to OGG on first use), then packaged as a Java .zip resource pack or a Bedrock .mcpack ready to install.