It's pretty cool, but it's not something that could have been actually done in the 1930's. Each of the instruments could be played in this way, but the recordi

It's pretty cool, but it's not something that could have been actually done in the 1930's. Each of the instruments could be played in this way, but the recording, mixing and mastering they used for this wasn't done using 1930s technology. So while it's fun to hear the unique sounds of these instruments playing a song like this, it wasn't technically possible for this song, as they present it to us, to exist back then.