CrowdSync is an open source project that will synchronize many devices to perform in time with each other to a musical track.
Read through Nick and Jason's blog posts for a more detailed technical explanation:
CrowdSync may be freely distributed under the MIT license.
To run CrowdSync, drop the contents of the public/ folder into a folder in your web root.
Additionally, drop the contents of ws/net/ into your web root as well. If your web host supports ASP.NET 3.5 or greater you should be set.
Test the web service by going to http://yourdomain.com/yourfolder/crowdsync.asmx. If you see the web service help page, you're in business.
You should be able to load index.htm or tree.htm and see some action.
In order to play audio, CrowdSync requires a webkit browser. Although we really liked the Mozilla API and have plans on supporting it in the future,
we needed to stick to Chrome for running tree.htm for the performance benefits that the V8 JavaScript engine offers.