This just in from our friend James Cobalt at Boston SOS:

MP3-EXP is an MP3 Experiment style audio track that can be launched by anyone, anywhere, anytime people are willing to come together. Created by BostonSOS.org specifically for Urban Prankster groups outside the official Improv Everywhere Mp3 Experiment Tour, the nearly hour long track allows pranksters everywhere to get in on a bit of the fun. After a successful test run, the first large scale MP3-EXPerience will be in Boston this Saturday at 3:00 PM at Christopher Columbus Waterfront Park. All the details on this Saturday’s run as well as how to get it going in your own town/school/church/commune can be found here.

In other Mp3 news, we just put up an official Facebook event for the NYC experiment. RSVP now!

We’ll put up events soon for the other 3 cities as we get the details nailed down.