Custom Music Discs [1.21.4]

Hello! I'm trying to make a custom music disc for my datapack, but it doesn't seem to be playing any audio. I'm pretty sure everything is defined properly, but it just refuses to work.
The music disc sound is located in eclipse_rp/assets/minecraft/sounds/records/nocturne.ogg,
The jukebox song file for it is located in eclipse_dp/data/eclipse/jukebox_song/nocturne.json,
This is what the nocturne.json file looks like:json {     "description": {         "text": "Nocturne"     },     "sound_event": {         "sound_id": "music_disc.nocturne"     },     "comparator_output": 8,     "length_in_seconds": 97.0 }
And this is what the sounds.json file looks like:json {     "music_disc.nocturne" : {         "sounds": [             {                 "name": "records/nocturne",                 "stream": true             }         ]     } }
Any help would be much appreciated!