can not play song in players

This is not a documentation bug, it is a question about using totem.

Hi Akshay,
You reported this awhile ago, unfortunately in the wrong place. This is a question about using Move Player, not a bug report.
In order to play "restricted" (i.e. proprietary) formats for music (like mp3s) and videos (like DVDs), you need to install extra codecs, which are most easily available in the Medibuntu repositories. For directions on setting this up, please see https://help.ubuntu.com/community/Medibuntu
Cheers.

Play mp3 and dvd under Ubuntu install skype googleearth acroread and other stuffs using Medibuntu

First please install https://help.ubuntu.com/community/RestrictedFormats

You need to have extra repositories enabled..

Please first enable the universe and multiverse repository:

Open System → Administration → Software sources → [ Tab Ubuntu software ]

enable "Community-maintained Open Source software ( universe )"
enable "Proprietary drivers for devices ( restricted )"
enable "Software restrictecd by copyright or legal issue ( multiverse )"

Close and confirm the repository reload.

Type the following command in a terminal (applications → accessories → terminal)

sudo aptitude install vlc smplayer mplayer

To get better dvd playback and optional packages here the medibuntu available software list http://packages.medibuntu.org/
you need to add the medibuntu http://www.medibuntu.org/ repository to your /etc/apt/sources.list file:
( here the medibuntu howto https://help.ubuntu.com/community/Medibuntu but see below )

In short please open a Terminal from the menu Applications → Accessories → Terminal and type or copy and paste:

sudo wget http://www.medibuntu.org/sources.list.d/`lsb_release -cs`.list --output-document=/etc/apt/sources.list.d/medibuntu.list; sudo apt-get -q update; sudo apt-get --yes -q --allow-unauthenticated install medibuntu-keyring; sudo apt-get -q update

-- give your user password when requested, you don't see nothing when you type it, then press enter

Now to install, type:

sudo apt-get update
sudo aptitude install ubuntu-restricted-extras libxine1-ffmpeg libdvdread4 libdvdnav4 libdvdcss2 regionset gnome-mplayer
sudo aptitude install non-free-codecs w32codecs gstreamer0.10-pitfdll gstreamer0.10-plugins-good
sudo aptitude install gstreamer0.10-plugins-ugly gstreamer0.10-plugins-ugly-multiverse

give your user password when requested, you don't see nothing when you type it, then press enter.

You can also install other Medibuntu repository provided optional software http://packages.medibuntu.org/ :

sudo aptitude install skype
sudo aptitude install googleearth
sudo aptitude install acroread

Hope this helps