[domh]

My friend made this site to try and surface the best place to buy music: https://streamtoshelf.com/

He also made a section of the site that allowed you to login via Spotify and it would aggregate your listening history and tell you how much it would cost to buy all of your most listened to albums. Annoyingly Spotify seems to restrict the oauth app creation process, so users have to be invited by email to access that.