This app powers Improv Everywhere's Mp3 Experiment project. The app will synchronize playback of a custom audio file for all participants who have downloaded it and joined the event. Users simply need to have the app open at the event's start time, and the audio will automatically begin playing in sync.

The Mp3 Experiment is a participatory audio adventure where attendees download an audio file and listen to synchronized secret instructions in a public space. Hilarity ensues as participants carry out ridiculous, synchronized instructions delivered to their headphones via narrator "Steve" and everyone else tries to figure out what in the world is going on.

We stage a new Mp3 Experiment in New York each year and also tour the project to college campuses and festivals around the world.

More information:

What’s New

Version 3.0.5

- countdown timer bug fix

Ratings and Reviews

3.4 out of 5
7 Ratings

7 Ratings

Mrh5144 ,

Needs work, but great idea

I started the app literally a second before it was suppose to start and it would not start for me at all. Just said thank you for participating. The app should start are the correct time and sync with everyone at the same time. It worked for my cousin but when she locked her iPhone it turned off and she went back in and had the same message. Luckily she downloaded the back up. Pandora the radio app, for example, plays music and does not shut off when locking your iPhone. This year was my first year as was the app and I look forward to it working better for next year! Great idea!

c. todd ,

Works flawlessly

The update they made to this app is awesome. Works perfectly. What a fun way to get a big crowd of people in sync. My family goes to the NYC event every summer.

darkmagic0xx ,

Good, but needs work

I like everything- the app is pretty well created, but the mp3 experiment wasn't easier with the app... When I locked my device at 3:01 , the app was still opened but playback stopped and going back to app, it said - 'thanks for participating ; the event has now ended' ... For next year, try to fix the app do it resumes playback in the correct place in case it closes (: otherwise, nice job!


Improv Everywhere Productions, Inc.
33.4 MB

Requires iOS 10.0 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating
Rated 4+
© Copyright Improv Everywhere Productions, Inc.


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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