I went to http://rpmfusion.org/Configuration to get RPMFusion working for Fedora 13. After following the instructions and getting the RPMs, I issued ‘rpm -Uvh xxx’ for each of the correct RPMs. I then issued a ‘yum update’ and got the newest version of the RPMFusion softwares.
From there, I went to http://www.fedorafaq.org/#installsoftware and followed the directions.
Both MP3 and DVD playback work.