I'm a music producer who constantly renders new music to take on the road and listen. Currently I use iTunes Cloud, which allows me to upload my music and stream from all ios devices. Is this somehow possible with Ubuntu One streaming? I did notice that it shows up in the files app, but that requires downloading to play.
Ubuntu One has a Music streaming app for iPhone - see https://one.ubuntu.com/downloads/iphone/
As an alternative, if you can set up your own server you can use Subsonic (http://www.subsonic.org/pages/index.jsp) to organise your music and stream it to any web browser. Their are also streaming apps for iOS and Android.