When I try to do / playsound morediscs:music/chillen (the name of my mod and track) than the error comes up as: "Unable to play unknown soundEvent: morediscs:music/chillen"

I posted one for 1.7.10 but it wasn't supported so I updated it for 1.9.

 

Main:

Spoiler

 

 

Folder:

Spoiler

 

 

Json:

Spoiler

{
  "chillen": {
    "category": "record",
    "sounds": [
      {
        "name": "music/chillen",
        "stream": true
      }
    ]
  }

 

 

I believe you want the sound file to be in main/resources instead of main/java

 

Also, you should post your fml-client-latest.log file when you post an issue, it can help too

I notice that your package name and resource location are using "morediscsid" not "morediscs". You didn't include the code for your ModInfo class so it isn't clear, but maybe you have a mismatch between your actual modid and your folder naming.