Beware of adware and malware on the Mac. It can’t do much damage on OS X (macOS), but it’s incredibly annoyingly and trivial to remove.
I first came across the Mac app TuneUp a few years ago. It was essentially an iTunes extension that helps you clean up your library by identifying unnamed songs and adding track names and cover art.
Like many others, my iTunes music collection largely halted a few years ago with the advent of Spotify.