I had someone ask me the other day why I collect all the music data that I do and I wasn't sure how to answer. Some of it's an interest in my own listening patterns, and another part of it is nostalgia for the last.fm I used heavily during its heyday. I guess I like quantifying those things. It's become a bit more than that too — I curate artist bios, I pull in genre descriptions from Wikipedia, and I fiddle with metadata. I also put some of this data to work. I use Navidrome to listen to music. I've...