$ sudo apt-get update
$ sudo apt-get install python-qt4-phonon 

python-qt4-phonon is installed in your system.

Make ensure the python-qt4-phonon package were installed using the commands given below,

$ sudo dpkg-query -l | grep python-qt4-phonon *

You will get with python-qt4-phonon package name, version, architecture and description in a table

python-qt4-phonon package basic information: