I’m interested in selfhosting, if possible, an equivelant to last.fm – it would analyze the history of what I listen to, and provide me with recommendations, and listening history reports.
Aside, last.fm as a federated service would be quite interesting. It would be neat to add a federated social media aspect to it.
The issue, I think, is that having access to a user’s entire listening history could very well be used to identify that user – one’s full listening history is likely to be rather unique.