@Moon @NEETzsche @hj we're not following that anyway. I think the Listen type is perfectly fine for scrobbling, it does exactly what it is supposed to mean, you're listening to some kind of object. Those don't have to be AP style json objects with an ID. Of all the questionable uses of AP vocabulary, this is the least one.

There's a separate question, I think for now the Listen activity is just used to set the 'currently listening to' field in a user, right? If so, these activities could be transient, without an ID and wouldn't be persisted to any serve, which would make them easier to distinguish from potential long-lived activities that a hypothetical music server might have.