Why isn't Minecraft playing my sounds?

I created a resource pack in Minecraft and inserted a sound there.

The problem is that I can use / playsound to select the sound, but it won't play.

My sounds.json file:

{
"start announcement": {
"sounds": [
{"name": "sounds: startansage.ogg",
"stream": true}
]
}
}

I have restarted the resource pack and Minecraft at least twice but it still doesn't work. And the file works too, so I can play it normally, without Minecraft.

Does anyone know why that is?

That's up to .ogg. You have to delete that.

Thank you for your help, but unfortunately the file still won't play.

You have one too many braces.

{
"start announcement": {
"sounds": [
{"name": "sounds: startansage", "stream": "true"}
]
}

Thank you very much. Worked.