Have you seen this video? Very inspiring

Fairly, I don't have a clue what is happening exactly in this video: are those musicians performing the music in real time with each other? I suppose there could be some lagging in time between the performers. Could you explain a bit?

Chris

Wonderful video. Thanks for sharing.

I've seen the core band and can only recommend trying to see them if they are around. Grandpa Elliot is amazing and the respect that this group of musicians and journalists have for music is truly intense. Many thumbs up.

So glad we can all connect with this wonderful video.
Dazz,
Vjay has provided some info which might explain.
My understanding is the filmaker choose a song, one that has meaning for everyone, everywhere. He may have shown the film to all the folks in the video, picking people who are playing in the streets around the world. Then he asked them to play their version of the song so that he could splice the film into one.
I can think of another great song. IMAGINE!