Fedora 10 does not come with built-in MP3 support. To get MP3 support with Fedora, you can use RPM Fusion's YUM repositories to download MP3 enabled RPMs.
Enable RPM Fusion
First, install RPM Fusion's free and nonfree YUM repositories. For detailed information about installing RPM Fusion, see: http://rpmfusion.org/Configuration
su -c "rpm -Uvh http://download1.rpmfusion.org/free/fedora/rpmfusion-free-release-stable.noarch.rpm"
su -c "rpm -Uvh http://download1.rpmfusion.org/nonfree/fedora/rpmfusion-nonfree-release-stable.noarch.rpm"
Next, run this command to get the gstreamer plugins.
su -c "yum install gstreamer gstreamer-plugins-bad gstreamer-plugins-ugly"
Install Applications and Libraries
For Amarok with MP3 support, install these packages:
su -c "yum install amarok phonon-backend-gstreamer"
For MPlayer with MP3 support, install these RPMs:
su -c "yum install mplayer gnome-mplayer gnome-mplayer-common mencoder"
For XMMS with MP3 support, install the following:
su -c "yum install xmms xmms-mp3"
For xine with MP3 support, install these RPMs:
su -c "yum install xine xine-lib-extras-nonfree"
To create MP3s with LAME, install lame and lame-mp3x.
su -c "yum install lame lame-mp3x"
Alternatively, run this command to install everything:
su -c "yum install xmms xine mplayer amarok xmms-mp3 gstreamer phonon-backend-gstreamer gstreamer-plugins-bad gstreamer-plugins-ugly xine-lib-extras-nonfree mplayer gnome-mplayer-common mencoder gnome-mplayer lame lame-mp3x"