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.
The best non-open source app for Windows that plays music. Great at organizing music collections and even suggests local gigs based on bands you have stored in your library. But I would go for an open source alternative, and MusicBee doesn't help me have the same library on non-Windows machines.