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.
You’ll need some kind of database if you want recommendations… Listenbrainz’s data is open, so you might find some self-hosted service that uses that database and local history for recomendations, but… why not just contributing your scrobbles to that awesome project?
They do require an email for signup, but IMO they are trustworthy and you can just use some anonymous email if it’s important to you to really stay anonymous.