You may have seen this "jam" of street musicians playing Otis Redding's "(Sittin' on) The Dock of the Bay" song. I just spotted it and it is, of course, wonderful.
Watching it, I notice that everyone except the first guy is wearing what seem to be the same headsets. Looks like whoever made this recorded the first singer, then took the recording of him to various locales and nations in these headsets, had the other guys put them on and play along…then recorded them all and did a great mix. Very clever…