BiomeTunes

Each biome gets its own handcrafted music, and the tracks crossfade into one another as a player travels, without stacking several songs on top of each other. Outside, the mod plays ordinary biome music, while a sheltered spot keeps the same track but with the walls muting it. Underground areas use an underground pool of music, and cave biomes, dimensions and boss fights keep their dedicated tracks unchanged.

The sound is picked through a fixed-cost pass that classifies the player's surroundings in the Overworld, so it does not add extra world queries. Sheltered spaces receive a wall-occluded low-pass treatment with short dark-room reflections, and an automatic gain-only fallback covers cases where the full effect is not available. A debug overlay that can be switched on displays the stored classification results, plus the current low-pass and reverb states.

BiomeTunes is client-side only, so the server and vanilla servers need nothing installed, and it works in single-player. It is published for Fabric on 26.2 only, with the 0.6 beta file as the latest build from 2026-08-30. The soundtrack is included with the mod, and a resource pack is not needed. The mod is released under the Apache License 2.0 and is open source, with its source code and issue tracker public. Fabric API and Fabric Language Kotlin are required, and Mod Menu is optional.