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.
Not really meant for self hosting, but have you looked at listenbrainz? The software and data is open and it’s not a commercial service.