There is no mp3 support in CentOS! Or is there? How about other multimedia formats?
Yes. There is no mp3 support in CentOS, as there is no mp3 support in the distributions from upstream. It’s not included because of legal (patent) issues. You either can encode your music files to ogg vorbis, which is supported in CentOS or install mp3 support from a third party repository, namely rpmforge. For example: If you want mp3 support for xmms, then install xmms-mp3 from that repository.