Electronics
There are several solutions that plug into a computer or server where music is stored, and then stream it to speakers.
One way audio companies are getting around the interference issue is by using airwaves designated expressly for that audio or video signal. That's what Apple has done with AirPlay, and now a great majority of audio products are enabled for AirPlay, meaning they will communicate with each other and access music stored in iTunes.
There are a number of ways to stream music from wherever it's stored, including iTunes, a home computer, a server, backup storage or from the Internet. Sonos makes some of the best-reviewed solutions for streaming music from multiple sources. The Sonos Play:5 and new, smaller Play:3 deliver digital music from virtually any source. Connect using the Sonos Zone Bridge (sold separately) and get all music stored on a hard drive, in an iTunes library or on Internet radio stations. You can access virtually any subscription music service like Pandora, Rhapsody or Spotify, and stream it to any set of speakers anywhere in the house.
A receiver/transmitter that Bose calls the Acoustimass Module uses wireless to transmit sound throughout the room, including to any additional wireless speakers placed on the sides or in the rear of the room.
The playGo from Bicom does just that with a high degree of fidelity, and comes in white or orange.
Q