Only built-in action types [1] are allowed, if you keep reading. This includes: "Listen - Song".

Specifically:

The following Built-in Action-Object pairs are available:

Like - Any Object Type Follow - Profile Listen - Song Read - Article Watch - Video, Movie, TV Show, or TV Episode

IMO a great change for user experience.

1 - https://developers.facebook.com/docs/opengraph/actions/built...