I’m not sure what a “music jukebox” is, and how it’s different from a music player, but I would recommend to try mpd. It should work with your collection, although I don’t have personal experience with collections of this size. Some clients might also not have been designed to work with such collections, so probably you’d have to try several.

The bot account itself. It appears to have been merely trolling, and the article seems to think it’s actually a bot.

This is obviously fake, but I wouldn’t doubt thousands of such bots actually exist.