OST Orchestrator
by alchemyyy
OST Orchestrator lets a player choose which background music plays in each situation, such as biome, dimension, cave, night, water, game menu, and more.
What it does
Music pools can be assigned to contexts like biome, dimension, caves, night, water and the game menu, and each assignment can be limited by configurable conditions and music categories. Changes between contexts can be tuned so transitions feel shorter, with adjustable delays, pitch variation and fade times. A log shows which track was selected, which helps when checking why a song played.
The mod runs on the client alone, so a server does not need to install it and players on a server that lacks it are unaffected. Duplicate sound instances are capped to keep the audio manageable. OST Orchestrator is published for NeoForge on 1.21.1 only, with version 1.0.0 released on 2026-06-03, and is released under the MIT License.
Key features
Context-based music pools
Background tracks are grouped into pools and assigned to biomes, dimensions, caves, night, water and the game menu.
Configurable conditions
Each music pool can be restricted by conditions and categories, so the selection follows rules the player sets.
Transition timing
Delays, pitch variation and fade times can be adjusted for the moment music changes after a context change.
Track selection log
The selected track is written to a log, making it easier to see which song was chosen and why.
Duplicate sound limit
The number of duplicate sound instances is capped, which keeps overlapping playback under control.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Who it’s for: Players who want to decide which background music fits each biome, dimension or situation, and who are comfortable adjusting settings. Only the player's client needs the mod, so it suits single-player worlds and personal use on multiplayer servers.
How it compares
Structure Music is open source under the GNU General Public License v3.0 only and is published for NeoForge on 1.21.1, with both the client and server needing it. Battle Music Crescendo is released under the MIT License and is published for NeoForge on 1.21.1 as an optional client or server mod, so it does not need to be on both sides. Simple Music Discs is published for NeoForge on 1.21.1 under All rights reserved, with both the client and server needing it.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| OST Orchestrator | NeoForge | 1.21.1 | Client-side only | 2026-06-03 |
| Structure Music | NeoForge | 1.21.1 | Client and server | 2025-04-01 |
| Battle Music Crescendo | NeoForge | 1.21.1 | Client or server, optional | 2026-06-23 |
| Simple Music Discs | NeoForge | 1.21.1 | Client and server | 2025-07-01 |
Questions
Does OST Orchestrator need to be installed on the server?
Which game version does OST Orchestrator support?
Can the selected music be checked?
In the catalog
OST Orchestrator is one of 12,078 Decoration mods on ModsFinder, and one of 5,201 Decoration mods for NeoForge. 32,366 mods support Minecraft 1.21.1.
More from alchemyyy
Similar mods
What the author says
Configurable client-side music orchestration. I am planning on adding many more external "listeners" that can be layered on for more refined control.
Official listing
- Modrinth page
- modrinth.com/mod/ostorchestrator
- Owner
- alchemyyy
- Published
- 2026-06-03
- Updated on Modrinth
- 2026-06-03
- Facts verified
- 2026-10-15