If you have an iPhone and a Windows computer, iTunes is how you sync contacts, calendars, etc. I have an Android and a Mac (several Macs). iTunes or an iPhone are the only way to hit an Apple TV with music. The Apple TV is completely dead to my Android phone, but I can navigate iTunes from my remote. The Android, of course, works a peach with Chromecast. There's so much hate for iTunes because it's essentially bridge software that is bloated beyond any reasonable capacity for life. In other words, nobody who hates on it so much has been able to find a workable solution without it.
raises hand That's me. I've given up on music in my life. It is just too fucking hard of a problem. I've actually debated just going back to LPs, because that's a soluble problem and well defined solution set with a library far larger than I have years of music listening left in my life. But... hipsters. So I just don't listen to music any more. sigh
LPs rule. Tapes rule. I own some eight-tracks (take that, hipsters) and they're really nice to throw on. Put on a side of an LP or Tape, go and take care of something like start to cook dinner, flip it to the B side when it's time to eat. It's a nice way of breaking up things and feeling a little less connected by using a physical form of media you've curated yourself as opposed to Pandora or Spotify...which do have their place at times.