Many clients have extensive iTunes libraries but have not yet integrated iTunes with their stereo or do not have a music system and want to listen on something other than little speakers attached to their computer.
There are two good solutions for this problem: the first is to use Apple’s built-in AirPlay to stream music to an Airport Express attached to an existing music system; the second is to use Sonos technology. With Sonos, if you have an existing music system you can use Sonos Connect to stream from iTunes and you can listen to internet radio like Spotify and Pandora. Plus, if you want music in other rooms you can add Sonos wireless speakers. On the other hand, if you do not have an existing music system you can build a fine one using all Sonos equipment.