How to add the ATrpms repository on CentOS 6, Oracle Linux 6 and RHEL 6

ATrpms have few but very good rpms
I use them to enable media playback on my desktop systems.

Open a terminal

# Become root
su - root

# Import the GPG key for ATrpms
rpm --import http://packages.atrpms.net/RPM-GPG-KEY.atrpms

# Open an editor
vi /etc/yum.repos.d/atrpms-stable.repo

# Paste this into the atrpms-stable.repo file    
[atrpms-stable]
name=RHEL 6 - atrpms-stable - $releasever - $basearch 
baseurl=http://dl.atrpms.net/el6-$basearch/atrpms/stable/
gpgcheck=1
enabled=1
priority=3
exclude=*release

# Update YUM
yum update

Done!