[all variants] iTunes Equivalent for Streaming Music

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http://ubuntuforums.org – I'm temporarily living in an apartment that has a built-in wifi-enabled sound system. I'm told that if you have your music in iTunes on your laptop, you can wirelessly play your music through the sound system. Being a committed Ubuntist, of course, I don't have iTunes (usually I use Quod Libet, but I'm familiar with other Linux players like Rhythmbox and Amarok). Assuming I can find the wireless network to which the sound system is connected, is there a Linux music player I can use to play my music over the network? (Hardware)