I'm doing it so I can listen to music on different devices.
Additional info: I'm trying to convert songs downloaded with a Zune Music Pass (ancient, I know) to MP3. Zune software stopped working and I want to back up my music before my laptop blows up. Music downloaded via Zune is a Windows Media Audio file (I think - it could be a Zune DRM type file but I'm not sure because the program stopped working).
+K for suggestions.