OpenSUSE's Tumbleweed rolling-release distribution continues picking up new functionality in a very punctual manner.
Just weeks after the last of the MP3 patents expiring and Fedora shipping full MP3 support, openSUSE Tumbleweed is now the latest distribution legally shipping MP3 support out-of-the-box. This comes with Tumbleweed using GStreamer 1.12 and enabling mpg123.