Can I Send Music to Two Airtunes at the same time?

Question

I read somewhere there was some software or other fix that would allow me to send my iTunes music to two separate Airport Express Airtunes (to different stereo systems in different rooms, of course) at the same time.
Is this true? If yes, how/where do I get the fix?

Answer 1

And there would be no easy way to synchronize the
sounds coming out of two Airport Expresses controlled
by two different users.
I'm not denying that. My point is that synchronizing multiple AirTunes streams is far from trivial due to the prebuffering delay and the fact that TCP is being used as a transport. The TCP transport is the most complicating factor because of the automatic retries when packets are dropped, which introduces latency (delays).
There's one other difficulty with TCP: The communication is point-to-point. This means that each Express must have its own stream. With each stream taking approximately 700 kbps of bandwidth, two Expresses would chew up 1.4 Mbps of bandwidth, three would use 2.1 Mbps, etc. If you have a less-than-ideal wireless connection, dropouts become much more likely with each added Express.
There's actually a convoluted approach I figured out over a year ago involving n + 1 users, each running an instance of iTunes, where n is the number of Expresses being streamed to. Nicecast was used to create an MP3 stream from one iTunes instance and then the other iTunes instances would pick up the stream and play it through the Expresses. It, too, suffered from the bandwidth escalation I described above.