One of the main problems that may arise when working with several computers and devices, is that you have all the music stored on one computer, and you have to copy it to the other device if you want to listen to music somewhere else in the house. To avoid this problem you can resort to Airfoil.
It's a small application that allows you to send the audio signal from one computer to another on the same network that has Airfoil Speaker installed, a free application available for iPhone/iPod, Mac, Linux and Windows or any compatible device with AirPort/AirPlay.
Enjoy music all around your house.
Airfoil allows you to choose which device the audio signal will be sent to, offering your the possibility to send the signal to several devices and computers at the same time. Another advantage is the possibility to be able to listen to an audio signal other than the one that is being sent.
Therefore, if you want to enjoy music all around your house without having to duplicate files on many different devices, download Airfoil.