I once built a site that used Spotify playlist data directly. The intention was that you could take one of your own playlist and find playlists that have the greatest overlaps. The intention was to find people with a similiar musical taste to yourself. Interestingly I found a lot of new music that way and also found other music directions that suddenly interested me. Thinking this a little further, it provides the pe…
Interesting idea! Slightly off-topic, but originally I had planned to organically grow the playlist count by allowing users to login with their Spotify account and reading their playlists. I even made a prototype...but turns out Spotify only allows working with user data once you have your API quota extended, which seemed like quite the undertaking.
I even went as far as setting a second developer account to have a larger limit ;)
I also did a writeup[1] on lessons learnt in case someone is interested in rinsing and repeating on this idea.