I have an iMac and two airport expresses -- one in the basement, on in the family room -- and I put on music for my kids all the time. I'd love to be able to pause the music and tell them something -- come up for dinner, stop hitting your sister, etc. Anyone have any idea if this is possible and how? Perhaps I could create live a live audio stream using the iMac's built-in microphone and point itunes to the IP address of the stream? Any other ideas?