You know every word. You’ve listened to it for hours on end. And maybe never have seen the show itself, but now here’s your chance to see the hit Broadway show “Hamilton” and help a dozen charities working for aiding immigrants.

“Hamilton” creator Lin-Manuel Miranda has issued a challenge. Post a video of yourself singing one of the songs from the musical and then challenging two of your friends to do the same.

It is called the #Ham4All challenge.