Following the spec here http://developers.facebook.com/docs/opengraph/music/
When I post:
POST https://graph.facebook.com/me/music.listens?song=%5Bsong url]
The response is invariably:
{
“error”: {
“type”: “OAuthException”,
“message”: “An unknown error has occurred.”
}
}
A bug report has been filed here: https://developers.facebook.com/bugs/124491790988961
According to a developer in the comments section, open graph music is not yet available to the developer public.