I'm working on building a personal alternative to Spotify and YouTube Music and I've hit two roadblocks.

1. Genre labeling in my library is inconsistent and manually updating 2500+ MP3s isn't feasible. I've tried using beets with the LastFM plugin in quiet mode but no luck. Any ideas?

2. Where can I bulk download diverse music catalogs? I've snagged some 'top 90s/80s/hiphop/etc' collections, but 2500 songs don't go far.

What I miss about Spotify and YouTube Music is their ability to auto-play similar tunes based on my current selection. Any advice would be appreciated.