And the beauty of VLC is that it's cross platform, so if you know VLC in Windows or Mac, you will know it in Linux. VLC is typically the favorite "universal" media player.
MPLAYER VS VLC PLAYER FOR FLAC MOVIE
There are some distributions (such as Elive Compiz) that install MPlayeras the default movie player which plays video files and DVDs perfectly. But when you do get it installed and running it works flawlessly. Mplayer is not usually the default video player in Linux nor is it the easiest to install or get running. Rhythmbox uses Gstreamer so it supports a wide range of audio formats. Rythmbox also supports DAAP sharing which allows you to connect to a centralized server. And although you can not use Rhythmbox with the iTunes store, you can download music from both Magnatune and Jamendo. Rhythmbox was inspired by iTunes so, as you can imagine, it integrates well with iPods and other such devices. Of all the music managers, my favorite is Rhythmox. XMMS is also themeable for all you desktop hipters -).
Once installed you can enjoy: mp3, acc, ape, flac, icecase/shoutcast, ogg, shn, speex, tta, wav, wavpack, wma. If you plan on playing MP3 files, like everyone does, you'll have to uninstall the XMMS installed on your distribution (if one was in fact installed), and make sure you install the player xmms-mp3 instead. And if you were a Winamp user you are in luck because it works the same way. But for pure music enjoyment, nothing beats it. No you will not be able to manage your iPod with this tool. Call me a purist but for straight up audio you can not beat XMMS.