If you found mp3 downloads for free in legal way , then there will be no problem at all. So we give you the websites where you can download the same.
MP3.com is one of the good website for Mp3 download. They have free music film downloads. Here you can get the downloads as when required.Not only film, radio, playlists many other things.
One more is Archive.org is music websites. Legal way of downloading the music. Jamendo,CCMixter are some of the Free music download websites, So Go and enjoy free downloads.