Adding a new event, or modifying the event name inside of music_definitions.json does nothing.

 
For example, given the following lines in music_definitions.json :

 
"redwood_taiga_hills_mutated" : {
      "event_name" : "music.game_and_wild_favor_game",
      "max_delay" : 180,
      "min_delay" : 60
   },
   "redwood_taiga_mutated" : {
      "event_name" : "music.game_and_wild_favor_game",
      "max_delay" : 180,
      "min_delay" : 60
   },
If I wanted to change the soundtrack played when a player was in a "redwood_taiga_mutated" biome and the "event_name" to a custom one I defined with a different list of audio, it would fail to play.
 

The following is an example of a situation that would not do anything when run inside of a resource pack.

music_definitions.json :

 
"redwood_taiga_hills_mutated" : {
      "event_name" : "music.custom2",
      "max_delay" : 180,
      "min_delay" : 60
   },
   "redwood_taiga_mutated" : {
      "event_name" : "music.custom",
      "max_delay" : 180,
      "min_delay" : 60
   },
 
sound_definitions.json :
 
"music.custom": {
            "category": "music",
            "sounds": [
                {
                    "load_on_low_memory": true,
                    "name": "sounds/music/custom",
                    "stream": true,
                    "volume": 0.30
                }
            ]
        },
"music.custom2": {
            "category": "music",
            "sounds": [
                {
                    "load_on_low_memory": true,
                    "name": "sounds/music/custom2",
                    "stream": true,
                    "volume": 0.30
                }
            ]
        },
 
 
music_definitions.json does not understand any of the custom events defined in sounds_definitions.json and will break, causing it to play the default soundtracks.
This is an issue because there is no customizability inside of music_definitions.json that lets us establish our own biome-based music.