Is it safe to download iTunes from a Retroactive site?

False. Unless by "most," you mean "make the songs visible and allow me to add or delete songs." However, this is a small fraction of what ITunes could do before Apple replaced it with Music. You can no longer make or edit Playlists. You can no longer organize songs by Date Added. You can no longer listen to songs on a desktop by plugging your iPod into a USB port. I could go on and on. Please don't pretend that Music offers any real level of functionality for iPods. Apple chose to eliminate their functionality in an attempt to push Apple Music and streaming instead of iTunes and downloading. It was a choice that hurt 99% of musical artists as well as those of us who prefer supporting them. But the choice was made, and they should own up to it. They no longer want to support the iPod/iTunes model, so they should get out of the way and allow third party apps to offer this service instead.