There are a list of websites and applications which would enable you to upload music and share. They are “Spotify, Google play, Pandora, Xbox, Sound cloud, Myspace”, etc.
There are a few restrictions and ethical aspects which needs to be taken care while uploading, downloading or sharing.
It is not legal to download a copyrighted music or any kind of files
It’s illegal to share files created or copyrighted by others and you do not have right to share plagiarism in imitating music samples or as a whole