iTunes is described as 'Organizes audio, video, and playlists, streams Internet radio, syncs with devices, manages purchases, imports CDs, supports audiobooks, and runs on Windows or macOS' and is a leading Audio Player in the audio & music category. There are more than 100 alternatives to iTunes for a variety of platforms, including Windows, Mac, Linux, Android and iPhone apps. The best iTunes alternative is MusicBee. It's not free, so if you're looking for a free alternative, you could try MusicBee or Clementine. Other great apps like iTunes are foobar2000, AIMP, Winamp and Audacious.
Swinsian just works. You add music files to it and it plays them. Doesn't move them, doesn't crash, doesn't complain. Very easy to build playlists which also don't just disappear. Swinsian just helps you listen to music in a simple and easy environment, while allowing you to build playlists as you go.