I haven't gotten far into using it yet myself, but gave you looked at Likewise? It's an app designed to act as a whole "if you like W then try XYZ!" thing. It has sections for movies and tv as well as books. Have a look - hopefully that's useful to you! Source: over 1 year ago

So I’ve been using this App called LIKEWISE. It’s been great so far because like Reddit it’s a community of users where you can ask users for movie and TV show recommendations and it displays what streaming apps are available for you to watch it from. I’ve discovered a lot of great movies and shows through this app however I haven’t been able to find a music recommendation app equivalent to this and I was... Source: over 2 years ago

I just shared a similar post to r/Metalcore about music-map.com, a service I've been using for years. It's a free website where you type in a band and it shows a "map" with a bunch of other bands listed. Closer the band, the more likely the two are similar. It's part of GNOD, a self-learning system that enables users to discover and discuss new music, books, products, art, and movies. I just realized... Source: almost 2 years ago