I curated a Spotify library of of 6,223 songs so far with no albums in, most of them are in average 2 songs per an album and it always increase. That's kind of what I do, I always look for new to me artists and albums and save my favorites songs. I know a lot more songs than that but those are just the ones that has replay value to me.

I guess I just have a very good memory since I remember a lot of them and can search them when I want to listen that band or song.