Getting MP3s of mainstream music, though? No clue. I stopped torrenting in the 00s and haven't paid attention to that arena since.
Collecting up mp3s of stuff I like, sticking them on my NAS and walkman, and having it is a fun exercise, even if it's not my everyday listening collection. I do often open up a music player and listen to my MP3s pretty often, just to listen to an album I owned.
I do like listening to internet radio a bit, tho honestly a lot of that is "greatest hits" stuff, so discoverability isn't what it used to be.
Youtube used to be really good for discovering new music! But their algo is now "your recommendation feed is the same on every video" leading to getting Ben Eater recommendation vids after watching some video about biking down a mountain or something absurd like that. I miss real recommendation systems...
Thrift shops, library shops, and even second hand "media" shops are everywhere and completely drowning in CDs. (DVDs too but that's another story)
For a couple bucks, you can go grab an armload of CDs, rip them, play them whatever, and donate them back or resell them, get yourself some random seeds for music discovery.
For an example of why this would be useful, listen to Abbey Road by the Beatles and notice the jarring transition from "I Want You (She's So Heavy)" and "Here Comes the Sun" on, say, Spotify.
Then listen to it on vinyl - you'll notice you have to get up, flip the record, and then start it again between the two songs which gives a natural break without the instant tonal shift instead of a smash cut from one song to the other.
This would play out the same on cassette tapes, flipping the side of the tape between the two.
It's only with the advent of CDs and streaming music that this has become a problem. It's not the end of the world, but I'm kind of baffled that there's not a way to automatically do this using some sort of metadata tags and intelligence in the player.
The indie scene is so much more vibrant these days. Literally anyone can self publish, and there are hundreds of thousands of amazing artists putting out excellent stuff. Usually I'll wander into some rabbit hole on Spotify and then go buy some music on BandCamp for my lossless collection.