If you want to add your own music to iTunes on Windows or want to ... music on that device or transfer files from your Windows PC to that device, iTunes is the best option. It is made by Apple ...
To add music to your videos ... I actually prefer using its web version. Using Canva on your computer makes it easy to tweak videos, whether they’re shot on your phone or a camera.
If your computer is using ethernet ... but only you can listen to it. If you want to add music to Spotify's catalog so everyone can stream it (and you can make money from it), there's a different ...